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.