Not so common. The straight edges at left, right, and bottom demonstrate this to be the bottom pair of a booklet pane. Print quantity of Scott 261a of 896,160 and 2011 catalog value for a used pane of 6 at $900, which yours is NOT a complete pane of 6 so don't get too excited, but it is still desirable as a used booklet pair perhaps worth $5-10 to a specialist despite the condition.
Used booklet pane pair ,has no value as I stated above .A full used booklet pane yes ,could be a rare thing but pieces of a booklet never heard anybody wanting them .
Quote: pieces of a booklet never heard anybody wanting them
I am collecting singles or preferably larger pieces from booklets, so now you have Not actively chasing them tough, just picking up whatever comes my way. @stagedew - Nice pair and postmark
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Posted 06/06/2018 9:16 pm
Not actively chasing them tough, just picking up whatever comes my way. 
