Up for sale here is this vintage 5.25" floppy disk.  This is extremely rare.  I bought a large amount of vintage computer equipment at an estate sale recently, and it had a lot of 5 1/4" floppy disks.  I am pretty sure this is for the Apple II operating system.  I do not know whether it works or not.  This is sold as-is, untested.  Please see my pictures for details.

US shipping and handling is $4, and international is $12.  I accept Paypal.  If you have any questions, please ask.

I have a number of other vintage computer items, collectibles, and vintage electronics listed--feel free to take a look!