I'm finally going through mine to make sure I have a set for each machine. I really don't need to be saving everything. These are top clamp and direct clamp feet.
Most of these I know what they fit - Free, New Home, National, White, Standard and the the older oddball sets, Davis, Eldredge (pre National), Household, Demorest, Domestic (pre white), Foley & Williams, Wheeler Wilson, Wilcox & Gibbs, Florence and Howe High Arm, Royal, New Royal (quite different). And probably a few I've missed.
This is what I have to sort through - I'll be fitting them to machines to get them all sorted.
After I get through this mess I'll get after the side clamp ones.