Treadle Singers are still sold today—primarily for those on Indian reservations, those who don’t use electricity, third-world countries. They have plenty of parts available.
A few years ago, I purchased one for a family member being posted to another country. However, she only used it for a neat piece of decorative furniture. :(
As a little child, I learned some basic sewing on my grandmother’s machine. Except for the extra types of stitches, I prefer the treadle.
I am still learning about threading it, etc.
It came with a belt, but it was a couple inches too short so I ordered a longer, newer one. When I get it, I will try the whole threading thing and make sure it works.
I got loads of bobbins with it, but also ordered a pack of ten assorted needles.
Serial number search shows it is a Singer 99K, produced in 1941.
It’s more antique than me!
;-)