If you can talk Ken Shiriff (righto.com) into decapping one, they won't stay secret for long. On such a question I suppose he might not take that much convinci

If you can talk Ken Shiriff (righto.com) into decapping one, they won't stay secret for long. On such a question I suppose he might not take that much convincing, though I only know him by his work. But intuitively for the age of the watch I would expect MSI or LSI ASIC on some kind of mildly exotic film process for the epoxy blob die-on-board packaging they used to do before true surface mount packages made it to consumer products.