Path,
Similar but not the same. I just spent a half hour taking pics and stubbing my toe ( on the HOTHER in it's case on the floor), editing them and putting them on photo buket. So I'm gonna post 'em, then I'm gonna root through my footsie box and see if I have one like you found at Nancy's Notions. If so I'll try it out and see how it works.
The foot is on my 401A and is a Singer snap on foot:
Close up of the foot.
Sewing.
End results.
So the end result is the same as Nancy's but the foot is designed different.