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What size battery is that? If it's a "B" cell it will be hard to find replacements in the US.
I'd go with 1970's based on what I see.
The text on one of the parts (back, Photo #3) says "W794"
So.. Week-7, 1994. ?
Some electronic parts have similar numbering schemes, but in the end it's just a guess.
This company is still in business and making very nice watches. https://www.junghans.de/en.html I have a Junghans key wind clock in the garage. You should be able to ascertain a comparative value by examples maybe found on eBay? I'm thinking it's around 40 years old also.