Phil, I think that this stamp was issued with roulette perfs.
Your copy seems to be just a pair.
Look carefully-the slit perfs are there. Agreed-a used pair.
How cruel, we ask for advice and it is provided ! U.S. experts we are not...but its still fun .
Expert I'm not but my advise to you is, switch from that old 150 to 250!
What do i have here my brothers an imperf pair ? there is no seam or perforations. Jopie pulled it out of a sandwich bag of U.S.
re: U.S. 2885 imperf pair ?