Both handcranks. F5271388, and F2599030. Basically a 1912 and 1914 Singer Sewing Machine. Looked at the Singer 66 manual, that came with one of the machines, to make bobbin thread, and to thread the machines to make sure that they worked. They did. One of them is a bit rougher than the other machine, well, they've been used. That was this week's purchase. I'm still working on last week's Red "S" Featherweight, that I bought locally. Got my "e" washer, so that I can put the tension assembly back on.