Apple 661-0474 Floppy Disk Drive. The first model of Apple's SuperDrive.
This 3.5" floppy disk drive has no door and is "auto inject" (or auto insert or auto feed where the disk is pulled in once inserted far enough) and used in most 68K Macs (Note that the Plus or earlier used a 400K or 800K drive and cannot use this).
Late 68K machines may also use this drive, but the cover, case or bezel will differ between "auto inject" and "manual inject", so they are not interchangeable. The last photo shows two LC III's, the top is auto inject and the bottom is manual inject - note the location of the eject hole as well.
All are made by Sony, 2MB, Model MP-F75W-01G (02G, 12G, etc), but all start with MP-F75W on the blue label. Note that these do not display any Apple identification on the drive.
These are available with or without the most common carrier or sled 805-0961-A. Carrier also sold separately.
Most have been cleaned and lubed. They read, write and eject.