Flat side bobbins
 

I have a box of flat side bobbins, not sure whence they came, but I have supplies from Mom and Grandma so it’s not surprising. Is there a chart or some way I can find what models use them ?

I don't know if there is a chart available but, my grandmother's Pfaff 260 uses flat sided bobbins. My FW and 301 also use flat bobbins.
Peace, Brenda

Take them into a sewing machine sales store.

Google "Bobbin Size Chart", then click on 'Images' scroll through until you can find something to identify the bobbin. Next Click on 'All' to find what machines use that bobbin.
Easy, but can be time consuming.
Good Luck
Mike

Try http://shop.sew-classic.com/Bobbins_c7.htm They have pictures and what machines they go to listed.

Mary