Stamp collecting — philately — is one of the oldest and most widespread collecting hobbies in the world. But not all stamps are created equal. Learning to identify truly rare and valuable examples requires knowledge of a few key factors.
Rarity: the foundation of value
A stamp's rarity is determined by how many were printed, how many survived, and how many are available in the market. Some of the most valuable Italian stamps are rare not because of low print runs, but because most examples were used on correspondence and subsequently lost or destroyed.
Key factors to examine
- Perforation (dentellatura) — Stamps are measured by the number of perforations per 2 cm. Unusual or irregular perforations can indicate rare varieties or proofs.
- Watermark (filigrana) — Flip the stamp over and hold it to the light. The watermark pattern identifies the paper type and printing run.
- Centering — A well-centred stamp (equal margins on all sides) is worth significantly more than an off-centre example of the same issue.
- Gum condition — For mint (unused) stamps, original undisturbed gum (OG NH — Never Hinged) commands the highest premiums.
- Cancel quality — For used stamps, a light, legible cancel that doesn't obscure the design is preferable.
Common Italian rarities to look out for
Among Italian stamps, the 1868 10 centesimi "De La Rue" and various Kingdom of Italy errors de colour are perennial collector favourites. More accessible are the early Luogotenenza issues of 1944–1945, where inverted overprints and missing colours occasionally surface in old collections.