(There's no video for Mac Stuff floppy disks from 1984-85-86 yet. Please contribute to MR and add a video now!)
Various floppy disk images named "Mac Stuff" from 1984 to 1986, all of which are bootable with System 1.x on it and various utilities and apps. Not sure about the exact provenance or use of these back in the day.
(3.48 MiB / 3.65 MB)
MacStuff from 84, 85 and 86 / DSK images / Zipped
Emulating this? It should run fine under: Mini vMac