Can't be too rare. One just like them is standing in my shell collection. Does it say "W.R.A. New No. 4" on the primer?

UMC began offering the 14 mm shotshells along with the 12 mm/.410-bore shells in 1915 --



I'd imagine Winchester began offering them about the same time.

From the 1923 Remington Arms Co., Inc. catalogue --



From the current SoldUSA auction --

http://www.soldusa.com/rainworx/detail.asp?id=53856

Last edited by Researcher; 08/13/13 09:43 PM.