Silver Tongs - Help with pattern, maker and date

These hallmarks are on silver tongs. On one side (inside the tongs), there is an RR and on the other side from bottom to top: (what appears to be) a profile of a monarch’s head, letter “k”, a lion passant and (maybe) a leopard’s head. If anyone can help identify the pattern, maker and date for this piece, I would appreciate it. I believe this is sterling based on the lion passant symbol. Am I right? Thanks so much.
tongs RR 1.jpg
tongs RR 2.jpg
tongs RR 3.jpg

The pattern is what we in the UK call “fiddle”, but I believe in the US it is called tipt (or tipped). The maker is Robert Rutland and the assay office and year are London, 1825.

Thank you for this information.