Interesting comments about widespread use of this cancel in the "1920's and 1930's". Here's evidence of the cancel in use as late as 1941.
Also, around 1940 they "modernized" the plane and reworked the cancel as shown below.
I find it interesting that in these examples from Philadelphia, the "modernized" plane is on a cancel dated 1940 and the "older" plane is on a cancel dated 1941.
