If you think you might have a Scott 381 with this new shade of Brown Yellow, submit to PSAG and we will have it chemically analyzed for the

PSAG is excited to share this world-class gem with our PSAG followers. Scott 120 Used with light cancel and perfectly centered jumbo...

October is National Stamp Collecting Month! To celebrate, let's take a look back on the humble beginnings of stamps.

The U.S. 24¢ Purple stamp has been a philatelic mystery for 122 years. As explained in the articles below, these stamps are particularly dif

Here is an example of the BLUE error of color variety for the 4c Columbian – 233a. Also attached is a 4c Colombian – 233. This is an...

Lewis Bussey, PSAG’s new expert on R.F. Overprints. Lewis has studied, collected and maintains a large database of this type of material...

The following stamps are exceptional quality and would be an excellent addition to any US stamp collection. PSAG Cert 589619 This is a...

PSAG has now added an extra component - forensic analysis for color varieties.