I came across a Singer 301 which I heard was a very collectable model.
It turns out, that the Singer 301 is very close to a 221-featherweight. The whole functionality and bobbin package looks exactly the same as the featherweight as far as I can tell. Unlike the featherweight, the 301 has a "slant" needle.
Here is a picture of the bobbin assembly and the knob that lowers the feed dogs for free motion sewing.
This Machine came with a 3-drawer table and a special cradle that is required for mounting a 301 into a table.
watch machine demonstration video
watch machine demonstration video