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.)

There is also a darker dial ENH-200. Catalog page shared by @Citizen _collector
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Citizen’s first TC movement, the caliber 1930

The Junghans 667.26 is a 4 Mhz caliber that has been discussed here before:
1. When found in Doensen’s book published 2006
2. A dedicated thread in 2014 by @sekunde
3. A…

Junghans AT-cut 4 Mhz movement(s) (and some of what came before)

This thread is a discussion of three Citizen patents highlighted by @CitizenPromaster in the pinned TC thread.

This thread is not so much about this technology’s place in Citizen’s product line, if any, but about the invention on its own merits as an aid to energy-efficient quartz watch accuracy.

Attached as PDF, the US version of these patents are…

Citizen frequency correction patents

This thread is to collect and organize all information on the Citizen ‘4 Mega’ cal. 1730 launched in 1981, as existing information is scattered such as in the TC thread.

The Exceed 4 Mega watches powered by this caliber were the last known Citizen AT-cut wristwatches before the cal. 0100 pocket watch shown at BaselWorld 2018 and First Series wristwatches released to the market in 2019.

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Citizen cal. 1730