UNITED STATES-MYSTERY LOT: Large Priority Mail Envelope filled with glassines, stock cards, packets and album pages. 19th century Classics to 20th century Modern material. Commems., regulars, coils and coil pairs, PNC's, blocks and plate blocks, airmails, revenues, booklets and panes, SS's, etc., etc. Mint & used, all off paper, no covers. Much to sort through...who knows what you'll find.