Claude
The GAMM cachet features a detailed teal and green engraving-style illustration of azurite mineral formations with rocky outcroppings, accompanied by vertical 'MINERALS' text in bold teal on the left side. Descriptive text explains that azurite is a commercial source of copper often found with malachite. The stamp is the 29-cent US Minerals series stamp depicting a copper mineral specimen in golden-brown tones against a teal background. The postmark is a standard circular machine cancel from Washington, DC dated September 17, 1992, with ZIP 20066, accompanied by a 'FIRST DAY OF ISSUE' slugline.
Mistral
This First Day Cover features a detailed cachet artwork of a mineral specimen, specifically azurite, with green and blue hues, alongside descriptive text about minerals in the Earth's crust. The stamp depicts a copper mineral specimen with a teal background and 'Minerals USA 29' inscribed. The postmark is a circular hand-stamp cancellation from Washington, D.C., dated September 17, 1992. The envelope is in excellent condition, with clear and legible text.
(The automatic summaries sometimes misidentify the postmark as part of the cachet artwork.)
