Schmetz 206X13 sz80/12 10/pkg, Fits Singer Models 206, 206K, 306, 306K, 306W, 319, 319W
There are four vintage Singer sewing machines that use needles that are slightly different than the standard 15x1 needle used in 99.9% of all home sewing machines.
The models are Singer's first domestic zig zag machine, the 206 and its successors, the 306, 319, and the rare free arm 320.
The correct needles for these models is the 206x13