Unknown (Mellone #35) John Muir 1964 First Day Cover
The text reads:
First Day of Issue"
Some stamp dealers refer to this cachet as "P. Press."
This cachet is the last of those identified in the Mellone Catalog for this 1964 John Muir issue. However, follow the links below for additional First Day Covers we have discovered which are not in the Mellone Catalog.
Muir has subsequently been honored with a 32 cent postage stamp in 1998.
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