Lost
Your 1921 Singer looks like the exact same one I have that was my Grandmothers. I learned to sew on that machine. Mine however is not in very good shape, My Mom stored it in a humid basement for quite a while so the wood is warped in spots and I have no belt for it. I've often thought about getting a new belt and seeing if I can get the thing running again. right now it mostly collects dust!
Marymargaret