Vintage Singer and greist sewing accessories read description

Description

Vintage Singer and greist sewing accessories. Not sure what's complete and what's missing pieces or if anything works. I know nothing about sewing but would take more pictures if you need to see something more clearly.
Singer Hemstitcher 121387
Greist blind stitch hemmer
Greist automatic decorative zigzagger #1
Singer buttonhole attachment 121795
Metal container with mostly singer parts (2 small right angle pieces not marked singer the rest of it is)
Box with random sewing stuff
Manual for singer 15-91 with original purchase receipt for September 23rd 1949
1/4 full 30 cent can of singer oil (not pictured)