The rear sight is wrong isn’t it?
Ya, looks like a 50's EG, R, F rear sight, not for an SRC.
I don't see one guy paying alot I see 3 guys working their way up to that final price, one guy went $3750 and the other two fought up over $4000. Auctions are hit and miss, seller should be real happy. If it had been two guys with not so much money it might have ended at $500.