Thanks. I have several Schermack precancels also, but this is the first one I've seen as an imperforate without the Schermack (or some other) mailing equipment perfs. I can only imagine it wasn't the most convenient thing to separate these stamps for mass mailings (which was generally the way mailings were done with precancels).
This precancel is not known on imperf stamps. If you look at the top-left of the stamp, it appears to have the remnants of a perforation that was trimmed away.
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