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J JudyKHow do you open it? It’s not obvious to me
You will probably need to pry it open with a knife. First, remove it from the mounting, then look closely at the back and around the side and see if you can figure it out. If you can't, take it to a watchmaker. We can't help you with the photos you've provided.
I would say late 20s is about right, I wouldn't trust those charts to greater accuracy than that. It appears to be a cal 1188 movement, and it is in a US case made by Wadsworth, which was sometimes done to save on import duty. Note the 4063 on the back of the case itself matches the last 4 digits of the case number inside the case-back. That was done as a way to marking matching case and case-back.