Interesting. Both sites mention the Sinclare Black Watch. I had one of those ordered from the back of the Popular electronics magazine. The flex pcb cracked. Wound up trading it and other stuff for the chair I now am sitting on and have for the last 30 years.
The watch was more of a novelty quite large and not all that wearable.
Almost bid on an empty Omega LED digital case yesterday. Forgot to bid. Sold on the high side of what I might have bid. Not that I need another empty case project.
Have a Nat semi and Fairchild LED digital. Neither work. Not really my style, more of having them for historical reason. My mentor would note that during the quartz crisis there were 35 watch companies in the silicon valley. All but TI failed. He liked to point out the display in the La Chaux de fonds museum, where some were on display in a back corner. His stamping company made some of the parts.
I have a number of threads on these. LED and LCD are trivial compared to quartz mechanical. LCD being a subject unto itself. Cheap film cameras also have LCD and flexPCB connection. Did get some Z tape, which I have yet to try. The fiber laser tends to burn away either too much or too little material.
This here is thread drift as the subject is on the quartz mechanical and specifically the mystery dial variation.
Since the movement plate is solid gold. Omega is probably the only option for repair. Even then it may depend on the whim of who ever is available and has time. Noted above the sapphire disks are unobtanium, with the spares recalled from the repair chain. So unless stuff shows up in an estate lot there probably is not too much out there in the wild.