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

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

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

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

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

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…

Click to expand…

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

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