Attached is a Citizen Technical Manual obtained from the Cousins UK web site, if memory serves.
My best guess at the date is 1985, from the last page:
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Continue readingBasic ‘GPS’ clock for me in East Asia
I have selected a ‘starter’ model as below:
The interesting bit is that it claims to also read the PNT sats of Rus…
Continue readingThermocompensated chronograph function in a HAQ
One of my earliest posts to this forum asked, “Is chronograph of a HAQ necessarily also HAQ?”
Continue reading@gaijin replied that his X-33’s MET (mission elapsed timer) had not varied from the timekeeping of the watch for over 900 days.
@Tom-HK said, “Given that we assume a count correction application after a particular inhibition period, as being the TC method that ETA uses, I cannot…
OT: Confirmation that GPS spoofing affects time, not just location
From a paywalled WSJ article, key points:
"Pilots, aviation-industry officials and regulators said spoofed Global Positioning System signals are spreading beyond active conflict zones near Ukraine and the Middle East"
"Pilots have repo…
Continue readingGS quartz focuses on 9F85/86/61/62
It seems that both the 9F83 day-date and the 9F82 without IAHH have ceased production. Here’s their last seen new models:
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Source Plus9Time GSDB
What’s in current production are thus:
9F85 – time and date with IAHH
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Citizen thermocompensated caliber history to 2019
Jump to the latest v1.0 of the PDF (January 2026).
Note that the current list includes analog TC calibers, all lumped into 'Gen 0'.
Original post below
Starting from the caliber lists shared by @Plus 9Time (here and here), I am constructing…
Wearing AW on ankle, and other ways
NYTimes:
A small but growing movement of ankle-watch acolytes has been afoot for a couple of years, as various users of Apple Watc…
Citizen’s first digital TC movement, the caliber 1930
original title: Exceed ENH-205 with caliber 1930
Vintage find with Citizen’s first thermocompensated movement, the cal. 1930. (But not necessarily the inaugural watch model of 1981.)
Continue readingVintage find with Citizen’s first thermocompensated movement, the cal. 1930. (But not necessarily the inaugural watch model of 1981.)
There is also a darker dial ENH-200. Catalog page shared by @Citizen _collector
[ATTACH type=”full”…
Wearing AW on ankle
NYTimes: “
A small but growing movement of ankle-watch acolytes has been afoot for a couple of years, as various users of …
70s and 80s Citizen quartz service manuals
I have obtained a set of 40+ year old of service manuals, guided to the listing by @CitizenPromaster. Thank you, sir.
The service manuals consist of 4 binders. Pages are cardstock, clearly made to last. There are also overleaf pages for complex diagra…
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