The Lake Erie Fireless Tru-Flite Shell.
This is a steel case 37mm Super Long Range (350yd) Tear Gas shell with a W.R.A. New No.4 primer.
The highest Patent number on the case is 1878489.
I have read that the W.R.A. Co. New No.4 primer was used in shotshells circa 1909-1933, but has been seen in flare cartridges as late as 1942.
Can anyone help date this tear gas shell?