I just can’t quite work them out I’ve looked and I’m pretty sure it’s the queens head facing left so between 1837-1890, bit that’s as far as I got!
From left to right:
Crown - Sheffield Assay Office mark
Date letter H - 1875
Lion Passant - sterling silver
Queens head duty mark
JF - maker’s mark of James Fenton / James Fenton & Co of Birmingham
Birmingham manufacturers seem to have sub-contracted knives to specialist manufacturers in Sheffield but with their own maker’s / sponsor’s mark in the hallmark.
Much appreciate phil