skiny, welcome to the group. Are you looking to start your own collection and build upon this one? I don't know much about non USA stamps, but those appear to be Cancel To Order (CTO) issues. Basically, the PO canceled them while still mint never used and sold them to collectors. I'm sure some of the others will chime in and correct me if I'm wrong.
Welcome Skiny, In my collection they live at: Aden Protectorate~Kathiri State of Seiyun No Russian stamps there. They all attract a Stanley Gibbons number if you have a catalogue.
Welcome Skinny. When you have time, be sure and go to the "Introduce Yourself" forum and post another message there. It gives everyone a chance to "meet" you.
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