What amazed me is how many times I've heard that FWs don't have very good piercing power ... then it turns out it was a FW in my memory. That's um sorta funny really.
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Button hollers:
Singer;
All green packaging = straight low shank
All reddish packaging = slant shank
doesn't count with the pasteboard boxes though.
Greist also added ZZ sub versions in their line.
Joe