The Philatelic Book of Secrets, published by Professional Stamp Experts (PSE), is an essential reference for collectors of pre-1940 stamps. It discusses subjects such as regumming, reperforating, grading, color varieties, paper types, and expertizing. Book is brand new except a bent corner on the back cover (see scans).
PSE's The Philatelic Book of Secrets (Almost New) - Essential Reference
This item is returnable, for any reason, for up to 30 days from the date of mailing as long as it is returned in the same condition as it was sent.