Already said pawnshops are getting scams by the China super fakes. There are a lot of them in local pawnshops. Though in this case since the serial number checked out it’s probably a frankenwatch with fake parts.
Pawnshops aren’t equipped to verify the super fakes nowaday when even watch dealers need spend a lot of time with specialised equipment to verify. So beware. Customers seldom do not redeem pawned Rolexes as the pawn price is usually lower than market price for most models. So even the pawn ticket is worth some money to 2nd hand dealers. So a Rolex left unredeemed is usually a lemon