Possible Usage (3rd class?)
Parcel Post Stamp Unsealed Usage
This cover is an example of the correct usage of the Parcel Post issue.
Unfortunately, the date of use is not known. Either this is a correct usage in the first 6 months of 1913 to send out a product sample by parcel post, or it may be a 3rd class usage to send out a printed circular. The latter may be more likely, since the envelope flap is unsealed.
This is an advertising cover, showing the logo and name of the Ammonol Chemical Company of New York City.
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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