This collectible plate block of four 5-cent postage stamps was issued by the US Post Office to honor Dr. William and Dr. Charles Mayo, founders of the Mayo Clinic.
Issue Date: September 11, 1964
First City: Rochester, MN
Printed by: Bureau of Engraving and Printing
Printing Method: Rotary Press
Perforations: 10 1/2 x 11
Mint, never hinged condition.
We often have multiple copies of this item in stock; the plate number and/or position may vary.
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