Provisional Government of Hawaii Transfer Medal

Interesting item recently sold on eBay. Postmark indicates it’s a 1973 issue. This medal was previously identified by me, but I never knew it was part of a postal cover.

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http://www.ebay.com/itm/Great-American-Places-HAWAII-TRANSFER-TO-U-S-Honolulu-Silver-Medal-Cover-31g-/182220080551?hash=item2a6d29c5a7:g:Ag0AAOSwTZ1XlvN0