Found this dated precancel and thought I'd post it. I believe it's a Type 548 from Elmira, NY and the initials seem to indicate "RRI" and I believe the date to be September 1941.
Anyone have any input on what company may have used this precancel? Both the initials and date seem to be 2.5mm high.
[Edit] Forgot to post the image. Here it is:
