If you could carefully remove the rear of the case & show a pic it would help. Typically takes a thin knife blade and the seam will have a gap in the area designed to be opened.
After that it should be easy to tell what you have. There are a score of similar watches and some have very nice Swiss movements. A variation on yours in that there is no second hand. Just the exclusion of a longer post & hand.
They can be very accurate time keepers.