I think it’s a copy.
The outside 925 T & Co 1837 stamp should be along the bottom edge, not the top.
Also the 925 stamp on the outside doesn’t look precise, same for inside stamps.
The inside stamp should also be in the centre, yours is off to one side.
It’s probably still sterling silver but there are just so many replicas, copies, fakes whatever out there, especially the silver range.