Greetings!

I have owned this watch for 25 years, and always get comments about it. Though, nowadays, when I visit a shop to get a new battery, I generally get offered money for it. This made me curious about the watch. I bought it before the Internet, and do not wish to sell it, but I really want to know what the story is about it.

Hours of searching Google has produced nothing. Well, except for a post somewhere saying that the "Sentinel" brand may never have existed. But the only identifying information on the watch' exterior is the Sentinel name on both the band, and the back of the watch.

Has anyone else ever seen this watch? What do you know?

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Many thanks for your kind expertise!
Bill