I may be wrong here, but this crown reminds me of the British crowns stamped into the lockplates of British Enfield Muskets/Rifles. So maybe some one working in the armoury was testing a stamp on something soft before hitting a hardened steel lockplate?
Here is a sight with a few examples of lockplate markings, there are many more!
http://www.victorianwars.com/viewto...?f=21&t=1268
Here is a sight with a few examples of lockplate markings, there are many more!
http://www.victorianwars.com/viewto...?f=21&t=1268



















