Apple 800K External Floppy Disk Drive, M0131. This drive came out in 1985, as it was clear already that 400k was not enough storage. As a Macintosh drive, there is no eject button nor daisy chaining port making it unsuitable for the Apple II.
As always, there may be a minor scuff or scratch. It has all it's feet. Cleaned and re-greased. Looks Nice!
Usable on any Mac with a floppy disk port.