Old Timex find at a thrift store

Hello watch crunch community!! I picked up this little Timex at a thrift store for $10. I'm trying to find out more info about it. Hoping you all can help. I have some shots here to assist. I know it's a mechanical and it's working I put it on a time graph app and it's running super slow about a minute slow so I imagine a service is in order and the crystal has a crack in it. Past that I don't know much else so any help would be super appreciated.

Thanks!!!

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Having the US Time Cor. name on the back presumably means it's pre-1969. Is there any small text at the very bottom of the dial? It looks to be a snap case back, so if you've got a case knife it should pop off (after cleaning best you can). What's the case size?

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PoorMansRolex

Having the US Time Cor. name on the back presumably means it's pre-1969. Is there any small text at the very bottom of the dial? It looks to be a snap case back, so if you've got a case knife it should pop off (after cleaning best you can). What's the case size?

Here is what I found. Case size is 27mm.

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infinitekronos

Here is what I found. Case size is 27mm.

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Well, no clues for the non-expert there. I'd figure there would be some nation of origin text at the bottom of the dial.

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PoorMansRolex

Well, no clues for the non-expert there. I'd figure there would be some nation of origin text at the bottom of the dial.

Thanks so much for you help! I appreciate your time.