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Hello Per, we see no silver guarantee mark and no fineness mark so most likely to be a silver plated items. Confirming Dognose's identification of the maker, the "silvercollection.it" has the manufacturers mark "HRS&Co", the same lettering that is on your items, also listed as belonging to Henry Rogers, Sons & Co of Sheffield. That site has an image of a different example of the mark but it also carries a pictorial mark featuring a flag on a pole over a crown, the same pictorial mark that you have photoed. The flag could a "Union Jack" flag, the flag of Great Britain. Henry Rogers, Sons & Co are referenced as being based at Eyre Street, Sheffield. Below is a reference for the company.
Rogers, Henry,Sons & Co. (, manuftrs of steel files, edge tools etc.& hardware merchants).
Address: 80 & 82 Eyre Street & national branches,
Recorded in: Whites Directory of Sheffield & Rotherham in 1905.
Fishless