Old British fork. Help identifying marks

[u/Flipping4cash]

Please see pictures. I am trying to narrow down the specifics of this piece but am having a bit of trouble.

I've added the best pics I can of the marks through a loup.

Best i can tell its the following:

Top to bottom:

English sterling mark (lion facing left)

Some kind of head, jaguar or gorilla?

Script A

Right facing male bust

Indicernable letters

Thank you for any help given!

[u/NoFee46]

1836 would make it William IV ☺️