seicitizitch wrote:Its januari 1977.. (7102677)
But I'm having a hard time believing Citizen would fit a "non-functional' PCB (porcelain) in this model, as wouldn't be functional as sold.
The movement is stamped 9070A.
Im having two similar movements. Both PCB's look 100% similar.
If it is a 9070 PCB fitted with 9021 silicon then it probably wouldn't have ever actually been meant for sale. Companies often produce a lot of product for internal use that is never intended for end-user sale - during product development, during pre-production and production, for various engineering purposes and for various marketing purposes, etc. Certainly seems odd but from your description it really does sound like there's a 9021-ish chip in there.
BTW 7102677 serial number indicates October 1977 In Citizen-speak - 1st number is year then 2nd and 3rd go from 01, 02, .... 11, 12 to indicate the month. Its possible that the PCB arrived in the case by round-about means particularly as you indicate that the movement showed signs of having been worked on previously.