Can you help identify these attachments
 

I have a Greist buttonholer and a Greist sewing machine attachment set. Can you tell me what machines this will fit? Also, can you help me identify the feet? I don't believe the buttonhole foot and throat plate in the lower right belong in the set. If I were to sell these, any idea of the worth? Thanks in advance for your help.

This one is easy - any low, straight shank machine. Not sure about that plate though . . .

You are correct, the botton holer and plate would not have been sold with the attachments.

As to worth- I don't see the feed dog cover plate or the longer mounting screw for the buttonholer.

For the other set, you have a couple of feet from the set that would have come in that box, and a few that probably came with the machine the cover plate went to. It looks like the foot above the ruffler has the adapter on it. If you don't have the adapter, then it's not worth much. Even with the adapter, it's a very common set and worth maybe $9 . . . and that would be if you had the complete set, and you don't unless you have a few more that aren't shown.

This is the kind of buttonhole attachment my Mom had. I remember the odd shaped templates.

What's it worth? Gift it to someone who can use it...

Thanks all for your input. I like the idea of gifting it. I can certainly see how I could quickly become addicted to vintage machines.