Claude
The cachet artwork by GAMM (Gerry Adlman) features a detailed black-and-white illustration of Albert Einstein against a dark background with physics equations including the relativistic mass formula (M=M0/√(1-v²/c²)) and mass-energy equivalence (M=E/C²). A vignette of Princeton University's Nassau Hall is included with the caption 'Father of the Special Theory of Relativity, the basis for the development of atomic energy.' The stamp is the US 15-cent brown Einstein commemorative (Scott #1285 or 1774) showing Einstein's portrait in profile. There are two cancellations: a circular Wespenex Station machine cancel dated March 4, 1979 from White Plains, NY 10601, and a pictorial hand cancel depicting Einstein's face with wild hair and glasses labeled 'ALBERT EINSTEIN.' The envelope header reads 'Albert Einstein 1879-1955' in red and blue text.
Mistral
This First Day Cover features a detailed cachet by GAMM, showcasing physics equations related to relativity, a portrait of Albert Einstein, and an illustration of Princeton University's Nassau Hall. The stamp is a 15-cent commemorative honoring Einstein, with his portrait and the word 'Einstein' printed on it. The cover bears a circular postmark from White Plains, NY, dated March 4, 1979, along with a pictorial cancellation depicting a caricature of Einstein. The cover is in very good condition, with clear and legible artwork, stamp, and postmark.
(The automatic summaries sometimes misidentify the postmark as part of the cachet artwork.)
