I wouldn't even begin to presume the perf configuration without the OP laying a gauge adjacent to it...
What's most interesting about this pair, is the right angle line configuration... which shows it's the uppermost right corner pair from the southwest quadrant of a master sheet...
Personally, I don't collect any stamps with SE's, but, I'd love to own this pair...
To the original poster: any time you have those colored guidelines on the 1920s series of regulars, they are always 11x11, 1922. Saves a lot of measuring time!
Confirmed it is 11x11. I've never seen a pair like this, thanks everybody for the information. I've got a lot of catching up to do after a 15 year break.
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