After a lot of research to find out what the Greiss attachment actually was (a lot of people said a buttonholer but it turned out to be a Zig-Zag), my wife posted this Model 120 for sale on Craigslist tonight. I thought this group might be interested in context of the age of the machine and relative obscurity of the attachment. We mean it when we say "best offer" ..!
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Best,J