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Steve M.The Mack Pinkerton pictured above purportedly is a postcard. I will not know for sure until I receive it from the ebay seller as I won it last Wednesday. In the description the seller states that it is a postcard and was postally used in 1916. I will post front and back when received.
The 2006 SCD, page 287, lists the know Pinkerton "Score/Phioto/Post Cards". It is unfortunate that SCD groups the blank backs with the postcard backs making it unclear which of those listed are in fact postcards.
These Pinkertons, scorecard , blank or postcard backs are not to be confused with T5 Pinkerton cabinets which are photos affixed to a carboard backing. The checklist for T5's is more extensive and the cards more valuable.