It
should have a Mostek, but that one in the picture definately isn't....their display had he traces on the underside of the display substrate, with small connection points/pins protruding upward for the wirebonds to the LED segment.
Bulova's # 9 & 15 show it about best.
9:
http://www.ledwatches.net/photo-pages/bulova10.htm
15 :
http://www.ledwatches.net/photo-pages/bulova17.htm
The one in the picture looks like CTC(Chicago Telephone Co.) display traces...they also made the driver's modules for Bulova and many of the regular Bulova LEDs - generally contacts at 2 & 7, although some at 1 & 3. Maybe our writer could tell us which button pattern his has. 2 & 7 means CTC only will work.
#5 has the traces like #2 - buttons at 2/7, CTC module.
Considering John Eton(owner of the watch linked in the post) is/was a serious enthusiast, he might have rigged himself something special.

http://www.retroleds.com -
Sales of vintage LED, LCD, analog watches,
parts and gadgets -
repair tutorials & tips
Nov. 2022 - back in business!! BItter divorce is in home stretch, come grabs some great deals, I had to open the safe . . . damn attorneys. piss.