The research I have is that the "improved copper primer gun" cartridge was 1852, so any label referencing that is post 1852.

https://dspace.wlu.edu/bitstream/ha...rchPapers_McLaughlin_1983.pdf?sequence=1

Dyson has the base version https://www.peterdyson.co.uk/acatalog/Charles-Lancaster--NLR--TL101.html

Labels change from 19 prizes, 20 prizes, at the same address, and 40, 46 prizes, 50 prizes, at no address. 20 prizes exists on an original label sometime around 1860-1870. I have an image on file, of a case for the same style gun as above. It looks like this repro https://www.peterdyson.co.uk/acatalog/Charles-Lancaster--NLR--TL212.html#SID=68

No address style here https://www.peterdyson.co.uk/acatalog/Charles-Lancaster--NLR--TL103.html

Post 1900, it switches to a more elaborate label with their royal pedigree and additional details.