Electroplate hallmarks...HELP!

I recently unearthed a bone-handled electroplate silver fork whilst weeding my orchard in Co.Waterford, southern Ireland…Im wondering if anyone can help me with the hallmarks to identify its age???
many thanks,
Jake
fork2.jpg
SILVER COLLECTOR.jpg

The makers are Walker & Hall of Sheffield. The psi is a date code, but unfortunately these are undocumented so I cannot give you an exact age; it is probably before 1900 due to the use of the crown. One of our members is working on W&H date codes and may be able to help if he sees your post.