Your stamp has two lines recut in the upper left triangle, and it is a sheet margin position, 90R2L, with nice margins.
It's an attractive cover. One that is commonly called a "ladies cover" due to the small size. It may be interesting to research the recipient for postal history study, if you haven't already.
Because the two inner lines (just inside the left and right framelines) have been recut, the stamp is actually an 11A. It is certainly not a scarce cover, but it is quite pretty nonetheless.
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