The stamp also has perforated initials of a company, called a perfin in that hobby. Doing that was approved in I think 1908 to help companies prevent mailroom pilferage.
Pattern B152 used by Bankers Life Association in Des Moines Iowa if you're curious.
It's perforated 12 - 12 holes per 2cm. It was current from 1908-1912.
It comes with two different watermarks, but they are very hard to tell while a stamp is on paper. I have the device needed, and have never gotten it to work reliably. The change came in 1910, but old stock would have been used for some time after.
I doubt it was mailed, either as a postcard or as a piece of first class mail.
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