Write this off as a bad job. There are many issues here. Firstly it has had a movement swap which is an immediate red flag, as above, the watch ain't what it claims on the (repainted) dial. That too is a big drag on the charm and value. The observatory medallion on the back is a Constellation signature and all but worn away there. There should be 8 stars in that cloudy sky. The bracelet is wrong too, hence the terrible fit at the lugs. The movement is in fact about 2-3 years younger than the watch and looks pretty grubby and worn. I could go on but I wont.
There are multiple reasons why this watch will just annoy you long term when you learn what a good one looks like and when you do finally decide to shift it on or swap for a better one you will have jokers like us slagging it off.