Y1257 Patented Medium Size Variant .54 Hunt and Jennings Self Propelled "Rocket Ball" Cartridge (Patent#5,701 / August 10, 1848)
Description: Here is a minty and hard to find cartridge. Normally the bases on these are swollen. As you can see, this one is excellent condition. This cartridge was patented by Walter Hunt in 1848. The powder is encapsulated behind the cork on the base. This variant doesn't have the patent date on the side and this is the medium variant produced out of the three sizes.
Measures: D .553" L .911"
Reference: RBTRF Vol. 3 No. 1045/1046