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Newly recognized shade of a Scott 381 postmarked on May 12, 1912

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

233a – Error of Color (BLUE) Compared to a 233 Ultramarine.

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...

The Latest in PSAG Services - Forensic Analysis for Color Varieties

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