Hi, the history of this lock; I bought it from a man in Newcastle along with several other locks a couple of years ago, His father had worked for a locksmiths co called “N F RAMSAY ” of Newcastle upon Tyne, I have an idea that this lock was from a royal rsidence because of the cypher. The lock is older than the decoration and the key is modern, I also got a couple more locks from the same guy more modern but with the same decorative spandrels, I rekon they were trying to have some kind of symetry in the house, anyhow when the company was sold and the guy retired he ended up with the locks. That is all I know, regards Hicapblue.