Metal hedgehog figurine

Any ideas about these marks on this hedgehog? TM on the side, and on the back: HL, circle with M inside, lion, N, Filled.

Looks like Sheffield silver from 1987.
Obviously filled with something else though!

Would look lovely cleaned up.....

Cheers
Has a coppery gold colour underneath so I think I'd better leave it as it is.

I think the current colour is how it has been designed. These modern silver items often come in great shapes. You have a lot of information on the outside to tell you who designed it, who cast it and what year. The filled bit is just to warn those who melt such things for scrap that the weight is not all silver.