bkay, I would say you have feet that fit more than one machine. One thing I've found is when the foot has that slot cut in the top part, that lines up with the needle hole, so you can see that those have a needle hole that is off-center. However the underbraider attachment looks like that which fits White, and White and National both have center needle holes, but the distance is just slightly less for the National, so if you put a foot for a National on a White, you'll break the needle as it won't go through the hole.

One if the reason I bought so many different machines was so I could check out the difference in how the attachments fit. And for most, they are unique is some way, so one way to help tell who made a machine was to see which attachments fit.

Here are some pictures showing the feet for different manufacturers, please ignore that the hemmers are not all the same size.

Fist pic show them lined up so you can see there are some differences in hight. The second shows them in the same order, and while the hole is centered in the foot, note how the clamp part is offset on some of them. Not all have the slot indicating where the needle hole is, but all of these do.

The thrid pic is showing the shirr plate that fits on rotary machines. This is the easiet attachment to identify what machine it fits, I know the first is White and the last is National, but I'd have to look up the other two, think they are older New Home and Free - but not sure.

The last shows two "universal" feet. with these, you have to put them on to see if they fit, mostly for much older machines. Note that one has a significantly narrower slot, that is what Free used, and they also used in on their "Royal" line, though other parts of the foot were different than the regular Free made machines.

Thanks, Cathy. Are they useful to anyone, or should I just toss them? (My oldest machine is 15-91.) My friend thought they were "tools", so bought them for me at either an estate sale or garage sale. He didn't say how much he paid for them. He's pretty cheap, so probably not much.
bkay

I have 2 boxes like this, with a less rolled hemming feet. My boxes are clearly labeled for Singer. I have a featherweight, but yet not tried any of the feet to see which ones fit.

I'm not sure, but I would guess that any accessories for the featherweight came in a cardboard box. I still have the accessories for my 201-2 and my mom's 15-91 and pretty much everything that fits those two will fit a featherweight.
I'll find the accessories for the 201-2 later today and photograph them for you. There is one item I have that was for the featherweight that came with the 201-2, which had a full complement of accessories. Obviously, the original owner also owned a featherweight as the drawer also had some bobbins for the featherweight and 301 in it..
bkay

Bottom left is a ruffler. The fork attaches to the needle bar to gather fabric. Above it is a tucker I believe.

It looks like the same thing my mother gave me when she gave me her machine - a Singer 15-91. I was going crazy trying to figure out how to use them. Finally called my mother and asked how they attached to the machine - what was I missing. They weren't in the manual for the machine and the Singer book she gave me. Turns out her mother (who gave her the machine for a wedding present) found them somewhere for a good price and so got them. My grandmother never sewed - my great grandmother (her mother) was a seamstress - so she thought all machines were the same and thought she found a deal. My mom couldn't figure them out, but passed them along (because in my family you never throw anything away that may be useful some day.). When I looked on the back there was a a "W" engraved in the back, so I donated them to a thrift store. I believed that to stand for the "White" machines which at one time were a competitor of Singer. I was kind of sorry that I didn't buy the White treadle when I found it back in '89, but I have a Damascus from my Great Aunt May which I prefer to own.