Help identify this ingot?

I received this off a member of my family and was hoping somebody could help by telling me what each of the hallmarks mean? I’d really appreciate the help as I’m quite interested in this, and ive stressed myself out trying to learn about them.

any help would be great thanks

From the top: -
Maker’s mark - Carr’s of Sheffield
Assay mark for Sheffield (Rose)
Lion passant - Standard mark indicating the purity of silver (925)
Date letter - ‘C’ for 1977
Monarch’s head - particular for this year, the silver jubilee of Elizabeth II
Hope this helps
Regards
John