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CitizenPromaster, Author at RK Watch Service https://rkwatchservice.com/author/citizenpromaster/ Watch Repair & Restoration Service Tue, 30 Sep 2025 18:53:25 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://rkwatchservice.com/wp-content/uploads/2024/03/cropped-RK-Watch-Service-Logo-Chicago-Watch-Repair-Web-32x32.png CitizenPromaster, Author at RK Watch Service https://rkwatchservice.com/author/citizenpromaster/ 32 32 The definitive Citizen Titanium Thread / Super Titanium / Ti + IP / Duratect / MRK / DLC https://rkwatchservice.com/the-definitive-citizen-titanium-thread-super-titanium-ti-ip-duratect-mrk-dlc/ Thu, 15 May 2025 08:00:54 +0000 https://www.watchuseek.com/threads/the-definitive-citizen-titanium-thread-super-titanium-ti-ip-duratect-mrk-dlc.3494498/ Watch Repair & Restoration Services in Northbrook & North Chicago Suburbs. Contact us for a free estimate at 224-213-7371. Learn more from our news blog.
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CitizenPromaster

This forum is littered with threads on the subject, but they usually are not very enlightening. Attempts have been made at an overview, but that hasn't stopped the question from reappearing. Hopefully this thread will change all that!

In this fir...

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]]> Watch Repair & Restoration Services in Northbrook & North Chicago Suburbs. Contact us for a free estimate at 224-213-7371. Learn more from our news blog.
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CitizenPromaster

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In this first post I will list interesting previous discussions and notable quotes. Later on I will adress some common misconceptions (like scratch resistance does not equal scratch proof) and discuss the past and present of Citizen titanium.

From…

The definitive Citizen Titanium Thread / Super Titanium / Ti + IP / Duratect / MRK / DLC

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The post The definitive Citizen Titanium Thread / Super Titanium / Ti + IP / Duratect / MRK / DLC appeared first on RK Watch Service.

]]> The Definitive Citizen Aqualand / Depth Meter C02X Thread (+ Aqualand I C520) https://rkwatchservice.com/the-definitive-citizen-aqualand-depth-meter-c02x-thread-aqualand-i-c520/ Thu, 27 Feb 2025 18:48:46 +0000 https://www.watchuseek.com/threads/the-definitive-citizen-aqualand-depth-meter-c02x-thread-aqualand-i-c520.5395075/ Watch Repair & Restoration Services in Northbrook & North Chicago Suburbs. Contact us for a free estimate at 224-213-7371. Learn more from our news blog.
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CitizenPromaster

The post The Definitive Citizen Aqualand / Depth Meter C02X Thread (+ Aqualand I C520) appeared first on RK Watch Service.

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Me and @Lepdiggums have been discussing the C02X Aqualand (or Depth Meter in Japan) in recent months, gathering info from the web and from old catalogs. I will use this thread to share this info, as there is some incorrect information floating around the internet. With the arrival of Aqualand junkie @CarlJohanUW I thought it was time to create this thread, so he can weigh in on the subject with his knowledge and experience.

First order of business…

The Definitive Citizen Aqualand / Depth Meter C02X Thread (+ Aqualand I C520)

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]]> Poll: should I stay or should I go now? You guys decide. https://rkwatchservice.com/poll-should-i-stay-or-should-i-go-now-you-guys-decide/ Thu, 27 Feb 2025 17:27:09 +0000 https://www.watchuseek.com/threads/poll-should-i-stay-or-should-i-go-now-you-guys-decide.5616137/ Watch Repair & Restoration Services in Northbrook & North Chicago Suburbs. Contact us for a free estimate at 224-213-7371. Learn more from our news blog.
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CitizenPromaster

I don't point out misconceptions about HAQ as part of some diabolical plan to make people lose face. I point them out so that the forum as a collective can come to a better shared understanding. But it seems my efforts are unappreciated. So I will hold a vote, so all the lurkers can speak their mind. Should I stay or should I go?

Considering the views in this forum, I will consider less than 50 total votes as a majority vote for option 4, which will have the same outcome as a majority vote...

Poll: should I stay or should I go now? You guys decide.

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Considering the views in this forum, I will consider less than 50 total votes as a majority vote for option 4, which will have the same outcome as a majority vote…

Poll: should I stay or should I go now? You guys decide.

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]]> On the origins of short-cycle logical regulation aka digital count adjustment https://rkwatchservice.com/on-the-origins-of-short-cycle-logical-regulation-aka-digital-count-adjustment/ Wed, 19 Feb 2025 09:01:51 +0000 https://www.watchuseek.com/threads/on-the-origins-of-short-cycle-logical-regulation-aka-digital-count-adjustment.5606988/ Watch Repair & Restoration Services in Northbrook & North Chicago Suburbs. Contact us for a free estimate at 224-213-7371. Learn more from our news blog.
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CitizenPromaster

For a long time, members of this forum thought inhibition was the only feasible method for 'modern' (ie single crystal 32 kHz) HAQ. Some members, like Catalin, suspected alternatives based on technical manuals, but the specifics remained vague. Thanks to (Japanese) sources I have found and shared, we now know many of the specifics, not only about early analog TC, but also alternative methods to inhibition, like time-division capacitor switching. Most general info comes from a...

On the origins of short-cycle logical regulation aka digital count adjustment

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On the origins of short-cycle logical regulation aka digital count adjustment

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]]> The Vintage Citizen Thread aka Show off your vintage Citizen (pre-1990) https://rkwatchservice.com/the-vintage-citizen-thread-aka-show-off-your-vintage-citizen-pre-1990/ Sat, 15 Feb 2025 10:48:42 +0000 https://www.watchuseek.com/threads/the-vintage-citizen-thread-aka-show-off-your-vintage-citizen-pre-1990.5301818/ Watch Repair & Restoration Services in Northbrook & North Chicago Suburbs. Contact us for a free estimate at 224-213-7371. Learn more from our news blog.
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CitizenPromaster

I want to create a central thread for discussing vintage Citizens and showing off your vintage Citizen, hence the title ;-)

Let's be very inclusive and define vintage as roughly pre-1990.

To kick it off, here is a pretty extensive article on the...

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I want to create a central thread for discussing vintage Citizens and showing off your vintage Citizen, hence the title

Let's be very inclusive and define vintage as roughly pre-1990.

To kick it off, here is a pretty extensive article on the history of Citizen: history14-27 (watchtime.com)

To learn more about vintage Citizens, there are two essential websites…

The Vintage Citizen Thread aka Show off your vintage Citizen (pre-1990)

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]]> Dual oscillator HAQ movements and methods https://rkwatchservice.com/dual-oscillator-haq-movements-and-methods/ Sun, 02 Feb 2025 00:20:30 +0000 https://www.watchuseek.com/threads/dual-oscillator-haq-movements-and-methods.5609012/ Watch Repair & Restoration Services in Northbrook & North Chicago Suburbs. Contact us for a free estimate at 224-213-7371. Learn more from our news blog.
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CitizenPromaster

CitizenPromaster said:
The 'old' classification misses a crucial point. You can have dual oscillator methods without it being a dual crystal oscillator method (the new Seiko patent drives this home).

If we were to generalize HAQ methods, it would be enlightening to do it like so:

1...

Dual oscillator HAQ movements and methods

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CitizenPromaster said:
The 'old' classification misses a crucial point. You can have dual oscillator methods without it being a dual crystal oscillator method (the new Seiko patent drives this home).

If we were to generalize HAQ methods, it would be enlightening to do it like so:

1…

Dual oscillator HAQ movements and methods

text

The post Dual oscillator HAQ movements and methods appeared first on RK Watch Service.

]]> Seiko HAQ wristwatch with a cesium atomic oscillator (chip-scale atomic clock) https://rkwatchservice.com/seiko-haq-wristwatch-with-a-cesium-atomic-oscillator-chip-scale-atomic-clock/ Wed, 29 Jan 2025 10:21:16 +0000 https://www.watchuseek.com/threads/seiko-haq-wristwatch-with-a-cesium-atomic-oscillator-chip-scale-atomic-clock.5608037/ Watch Repair & Restoration Services in Northbrook & North Chicago Suburbs. Contact us for a free estimate at 224-213-7371. Learn more from our news blog.
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CitizenPromaster

As I discussed in below quote, Seiko has patented a new HAQ method with dual oscillators (likely based on an older Citizen method for which the patent has expired).

CitizenPromaster said:
------------ NEW SEIKO PATENT WARNING --------------

What is also jumping out at me this time, is that JPS57116287A recently got cited by none other than Seiko Epson.

View attachment 18861739

The Japanse characters don't give anything away to us...

Seiko HAQ wristwatch with a cesium atomic oscillator (chip-scale atomic clock)

The post Seiko HAQ wristwatch with a cesium atomic oscillator (chip-scale atomic clock) appeared first on RK Watch Service.

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As I discussed in below quote, Seiko has patented a new HAQ method with dual oscillators (likely based on an older Citizen method for which the patent has expired).

CitizenPromaster said:
———— NEW SEIKO PATENT WARNING ————–

What is also jumping out at me this time, is that JPS57116287A recently got cited by none other than Seiko Epson.

View attachment 18861739

The Japanse characters don't give anything away to us…

Seiko HAQ wristwatch with a cesium atomic oscillator (chip-scale atomic clock)

text

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