Stamp catalogs are reference books that assign unique numbers to each postage stamp ever issued. The most widely used catalogs include Scott (USA), Michel (Germany), Stanley Gibbons (UK), and Yvert et Tellier (France). Catalog numbers help collectors identify stamps precisely, assess rarity, determine fair market value, and communicate with other collectors internationally. Keeping catalog numbers in your inventory ensures accurate record-keeping and simplifies trading or selling.

MNH (Mint Never Hinged) — The stamp is in original mint condition with full gum, never attached to an album page. This is the most desirable condition.
MH (Mint Hinged) — Mint stamp that has a hinge mark or remnant on the back from being mounted in an album.
Used — Stamp that has been postally used, typically with a cancellation mark.
CTO (Cancelled to Order) — Stamp cancelled by postal authorities without ever going through the mail, often with a neat corner cancellation, primarily sold to collectors.
VFU/FU (Very Fine Used / Fine Used) — Describes the quality of the cancellation and overall appearance of a used stamp.

Store stamps in a cool, dry environment away from direct sunlight. Use acid-free stock books or archival-quality albums with crystal-clear mounts. Avoid using adhesive tapes or ordinary glue. Maintain humidity levels between 40-55% to prevent gum damage or mold. For high-value stamps, consider using glassine envelopes within a safe or safety deposit box. Always handle stamps with tongs rather than fingers to avoid transferring oils and dirt.

Stamp values depend on rarity, condition, demand, and authenticity. Consult current editions of major catalogs (Scott, Michel, SG) for baseline pricing. Note that catalog values are often retail estimates — actual market prices may be 30-60% lower for common stamps. For valuable collections, consider getting a professional appraisal from a reputable philatelic society or auction house. Online marketplaces like eBay (sold listings) can also provide real-world pricing benchmarks.

Thematic or topical collecting focuses on stamps depicting a specific subject — such as birds, sports, space exploration, art, ships, or flowers — regardless of the issuing country. This is one of the most popular and accessible ways to build a collection, allowing collectors to follow their personal interests across global postal history. Our inventory tool supports theme tagging so you can easily organize and filter your topical collections.