That's probably the older of the Mark XV reps. Mine has the correct case back and correct 19mm lug width.
More importantly, that is a replica 2824 movement. I'd return that watch ASAP!
Didn't I offer you my 9411 Snowflake "Date" Sub with the genuine dial for $1000? My gen dial alone is worth $400-500. My 2783, with Tudor rotor, is regulated too at +2 secs/ week.