39mm. Complete set of 50 medals. In order to stimulate support for the preservation of the great historic sites where America took form, the National Trust for Historic Preservation, a non-profit organization chartered by Congress, issued this series of 50 medallic covers. Each cover pays tribute to a different major historic site in one of the 50 states. Each cover was postmarked on the medal's first day of issue at the post office servicing the site commemorated.
The set was issued from 1970-1972. Each medal is a 39 millimeter Proof.
Proof-like medals, not in covers, were also sold to individual states.
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