in case folks want to see the origin of these wonderful devices...
Here is (L-R) a Singer VS2 buttonholer, a Narrow Famous, and a Standard Famous
The VS2 is the second known buttonholer to have been patented. This particular one was made in 1887
I have never seen a complete version of the first type.
Unlike to "modern" ones, these do not use cams. You can set ALL of the following individually;
Size of buttonhole
Number of Stitches
Depth of stitch (bite)
Width of cutting space
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