Overprints

Imagine collecting overprints. Going thru a stamp catalogue, practically all countries have overprinted stamps.

I wonder if there is a world overprint book? I often see overprint booklets of different countries. Inquiring minds want to know.



Hyderabad O47 in the catalogue. Part of the India native feudatory states. There is another variety of this stamp that was printed with an unshaded background. Nice to have. I'm still looking.
I see this stamp all the time when sorting thru old world mixtures. Funny how you always gotta look at them too, just in case you get an odd one. I'm always looking for odd ones of anything. There IS money to be discovered in places most people would overlook.