Parcel Post Stamp Used as Intended
This cover is an example of the correct usage of the Parcel Post issue during the first 6 months of 1913. The cover was cancelled by a Cummins/Time-Marking machine in Chicago, Illinois, in May of 1913, and most likely contained a product sample from the Goodman Rainproof Coat Company of Chicago, Illinois.
Note the nicely-illustrated advertising cornercard on this cover.
Note that the day slug was not used in the cancelling machine. Parcel post items usually did not receive any dated cancellation at all, so this item is uncommon.
On July 1, 1913, the stamps became acceptable for any postal service, so you more often see them used for first class letters and cards from that date onward.
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