Can’t say if the plexi is original - other than that, it seems to be correct in every part. It also seems very, very dirty and worn in every part. Tired movement, water damage all over the dial, lume is gone, case has seen a polish or two…
Don’t know what “proposed to you” means - if you like it and it’s free, why not. A service is likely gonna set you back about what the watch is worth, though, possibly more.