Inside the envelope is a card which reads:
"We are pleased to send you this souvenir John Muir Memorial Hospital cachet with a John Muir Commemorative stamp affixed and postmarked the place and date of its first issue as a token of our appreciation of your valued assistance and support.
Since only 500 of these cachets are being issued, each should be a memorable keepsake, particularly to any philatelist you may have in your family.
Cordially yours,
Board of Trustees
John Muir Memorial Hospital
Walnut Creek, California"
Muir has subsequently been honored with a 32 cent postage stamp in 1998.