Jon,
Do you have enough info on the Minnesota ~B~'s to determine the year of manufacture? I know mine is ancient, but I'd really like to narrow down the year at least.
I can't find a serial number on it anywhere. The only marking under the front slide plate is the letter "D".
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Minnesota needle report..
I just finished off assembling 14 6 1/2" quilt squares from 3 1/2" squares of denim scraps. It worked great with the Organ MTx190 size 14 needle I used. The thread I'm using is C&C Dual Duty XP Heavy. I just could not see using a light weight thread on a quilt made from denim.
I only had one problem and that's when I stalled the machine as it tried to sew over 4 layers and created a thread wad. But that was my fault not the machines or the needles.
Joe