hi Ginger,
the dial, hour marks, winding crown, caseback etc look okay to me.
so far , to my knowledge, seamaster ref.2849 cal 503 should have "calendar" printed on dial at the 6 olcok position.
one worry thing (as also pointed out by others) is that omega does not have cal 502 movement.
suggest to bring the watch to watch watcher and ask him to open the caseback and check whether what are the ref. no. and movement model no. printed on the inside caseback and movement respectively.
anyway, cal 503 is a very good movement which is the first movement with "quick date setting" in omega!
stefan