1c-5c Pilgrim Tercentenary (548-550).
Blocks of four, cancelled or tied by "Washington D.C. Dec. 21 3:30PM 1920" First Day
duplex datestamp and oval grid on green legal-size Special Delivery cover to Mr. William Siebold in Washington D.C., purple special use three-line handstamp at center
VERY FINE. A RARE SET OF BLOCKS OF FOUR OF THE PILGRIM TERCENTENARY ISSUE ON A FIRST DAY COVER.
These were the only stamps ever issued by the United States that did not bear any words indicating the country of origin. First Day covers with anything other than singles are rare.
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