Dating wheeler and wilson sewing machines

It’s only 3.5mm thick at the edges, see photo above in the summary section.

I have so far not found a modern substitute for this bobbin, so if you know of one, do tell!

See my post on vibrating shuttle machines for more details.

Jones Spool is a rotary machine after Wheeler & Wilson D9, full size only.

The bobbins for Jones CS machines are the same as those used for Singer VS machine, i.e., the “bullet” shuttle.