I have a(dessert) spoon and fork set. Engraved with my grandfather's initials, so was

Hi Don,Many thanks for the excellent photos, I can now see exactly what you have.This is indeed a child's spoon and fork Christening set in its original presentation box.The mark is a little unusual, but all very authentic. It's a British Design Registry "kite mark" that is effectively a patent device used in Victorian times in order to copyright a design, and which actually contains a wealth of information.At the top of the diamond the small circle contains a "Class of Material" code which in this case is a "I" for metal (there was no separate designation for silver or silverplate).Underneath at the 'north' end is the number 19 which is the 19th day of the month. At the 'south' end is an "R" for August and in the 'east' is an "F" for the year 1873. In the centre is an "Rd" meaning 'registered design' or copyrighted. Thus the design for this set was registered on the 19th of August 1873, so can be no older than that date. But then it's probably not a lot younger either as these designs only remained commercially viable for a year or two and would be replaced by newer more fashionable patterns quite frequently.So the material is silverplate (electroplated silver) rather than solid silver. It's highly unusual for solid silver to have a British Registry kite mark because the assay office date letter served as a de facto copyright date instead.Although we will never know for sure, your set was most likely made by the Sheffield maker Walker & Hall as they produced a wide range of these Christening sets at the time and many of them were marked with a kite mark.This example, for instance, similar to yours, sold on line for $84 which is probably about right.I would give yours an auction or on-line value in the range of $60 - $100.It therefore has a full retail value (if you saw it for sale in an antique shop) of $200 which is also the replacement value for insurance purposes.I do hope this helps!Best wishes,Robert