Identify unusual british hallmark

[elenajudnick]

I brought 2 ivory forks and need help identifying the marks.
I have no idea on the first stamp???
I stand corrected but i belive the 2nd stamp is of George III
The 3rd stamp is the lion passant.
Can anyone help with possible town / maker /date please

[elenajudnick]

https://ibb.co/wdNz2K8

[dognose]

Hi,

Welcome to the Forum.

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Your forks were assayed at Sheffield in 1815. The 1815 date letter 'O', which combines the Sheffield 'Crown', is struck upside-down. There is no maker's mark shown, this is not unusual as this was often struck on the tang of the fork, and thus is no longer visible.

Trev.