I’ve just updated the page, by adding the COSC standards that were applied from 1973. It’s useful to have these on the same page to compare with Citizen’s standards.
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Sweephand’s Vintage Citizen Watch Blog- Citizen’s Automatic Chronographs (8100/8110) Instruction Booklet
- This Week’s Featured Watch #81 – the Varia-Matic (A1309)
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Sweephand's Vintage Citizen Watch Blog 