Need Help with identifying Silver ingot makers mark CH

Hi could someone help me identify the makers mark CH on my silver ingot and date? image|375x500

I am unable to identify CH as sponsors’ marks are not published. As your ingot has a Sheffield hallmark you would need to contact the Sheffield Assay Office to find out the name. The hallmark includes the special commemorative mark for the Queen’s silver jubilee and the date letter C for 1977.


Thank you Phil for your quick response.
Regards T