On Fri, 13 Dec 2019, Chuck Guzis via cctalk wrote:
Some could also be "flippies". Those were made by several manufacturers.
. . . and almost 40 years ago, for my first marketed product, I made and marketed plexiglass pocket shaped jigs for marking diskettes for punching them. Several models, a 5.25 into Flippy, and an 8" into SS/Flippy and DS. One some, I also had a jig for putting on hub-rings.
In the FIRST and LAST picture, at the lower left, the bottom three diskettes are a Memorex "1S" single sided single density, and two Memorex "2D" double sided double density. About half are the Memorex "2D", a handful of the Memorex "1S", a handful of Nashua 2D, a scotch 1D, . . . I'm pretty sure that those are NOT Memorex "flippies".
But, the previous owner could have had one of my jigs or a competing one, or could have had more than one drive or more than one system, or a drive that did both.
But the variant types don't invalidate your hypothesis of what system, any more than finding a few extraneous Macintosh diskettes in the box for your Windows disks. I assume that you are right, but there are some others thrown in.
("How the hell did those get mixed together?")