Grenadines of St Vincent commemorating our 200 years of American independence.
What is interesting is this cover have tied it with and mis-perf 8 cents Eisenhower stamp, and the inscription of "A Flat Design - Single Strike Coin". It looks more of a weak strike, or just a fatigue die on the reverse, obverse looks normal.
On the reverse has a handstamp of Personalized First day covers, and another handstamp that appeared to be Jim Heine.
Anyone have information with Error Coin of the Month?