Quote:
I have even seen (actually own a few someplace?) them on the backs of stamps! yikes! Sometimes just an initial or as elaborate as a small design notating from which collection that particular stamp was from...what were they thinking??
I asked a similar question about an owner's mark on the back of one of my stamps in this thread amd Bill Weiss replied..
https://goscf.com/t/40224Quote:
Yes, it was common for owner's (and experts) to hand stamp their ID on the backs of stamps. The only danger, of course, is if that ink runs through the paper and becomes visible on the front of the stamp. Then it is considered a fault or defect. Otherwise it's harmless.