A nice read.
I bought myself a similar styled watch in the late 1960s - mail order too. Pic below 'borrowed' from the Internet.
I believe this has the same movement as yours.
I didn't wear it for long and gave it to my Father in Law who wore it a couple of times and then it stopped!!!!
I still have it and due to lack of use is in excellent condition with just a little rubbing on the back for a nylon Nato.
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