3c Violet, Ty. IV, Imperforate (535).
Large margins to ample, tied by "San Diego Cal. Sep. 30, 1918 6PM" machine cancel on San Diego Society of Natural History corner card cover to Stanford University, pencil note on back "I have the advantage of you in not having to work with anything but shells--come up to see us"
, Very Fine, this is the earliest documented use of Scott 535,
ex Berkun, with 2003 A.P.S. certificate
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