No its not the modern version of Tinkers to Evers to Chance, nor is it the members of your favorite band. It is the names of three embroidery companies which made hundreds of the classic OA flaps in the 1950’s and 1960’s. Each of these companies,  Lion Brothers (LB), The Moritz Embroidery Works (MTZ), and the Geer Company (GER), had their own distinctive shape.
If you have ever wondered about the Blue Book abbrieviations (MTZ, GER, and LB); John Pannell has written a post describing (and showing) these three flap stlyes. Check it out.
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- In Mexico we have a word for sushi: Bait.
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