Hugh, I've collected pics of about 90 original Reilly labels and have dated them based on the SN of the guns in the cases, the models of the guns, the medals on the labels. Etc. Actually, I've only found one label with a strike-through, a 1898-03 label with an address change. So I think the Reilly's were pretty fastidious about their labels. Here are examples:
1848-1855 labels with 502 Oxford St., likely the site of their finishing facilities:
1855/6-1959 with the Crystal Palace and Paris medals.
Here are the medals: Left is 1851 Crystal Palace; Right is 1855 Paris
Here is thn only strike-through I've found - the address 277 changed to 295 made shortly after 1903 during the rapid decline of Reilly as a company:
