Remington umc shotshell question


Hello everyone,I bought this empty case recently.this all brass case headstamped “REMINGTON UMC No 20” could anybody told me the history of this headstamp or just tell me when does it made.Thanks!


It would be from the time of the 1910 to 1915 merger & was probably made for quite awhile after. It’s found in all the common gauges; 10, 12, 16 & 20


Thank you!