Ricoh Watch Co., Ricoh Keiki Co. Ltd., リクォーツ - Unofficial Riquartz Database
Analog watches
Digital LCD & LED watches
Combination analog/LCD
Correct Time Receiver
Quartz Timer timing & testing machine
Technical†
Some images of technical manuals can be seen in Technical
Date code†
- Stamped inside caseback; Year & 1-9 then XYZ, example "75-2" = Feb 1975, "77-Y" = November 1977
- Some watches also have a code in addition, which looks like the date in the Showa calendar, but which does not correlate with the date code above.
- Some early CMOS IC chips use the EIA date system, ie marked 7421 means 21st week of 1974.
- Quartz cannisters can be marked, ie NDK 76F is June 1977.
Information†
I would be grateful to receive information, especially the early 550 and 570 watches email to: jr AT umddb DOT net
https://pukiwiki.sourceforge.io
![[PukiWiki]](image/pukiwiki.png "[PukiWiki]")
