The Apple M0100 Mouse changed a bit over the years with several versions using the same model number. Choices offered are the beige mouse (rounded connector) with the number 590-0320 and the platinum mouse (rounded connector) with the number 590-0055-A.
Mice have the DE-9 connector and will work on the Macintosh 128k, 512k and Plus. Will also work on the Apple ][, ][ Plus and //e (with mouse interface card). May or may not work on the //c.
Currently only sold as part of a package with a 128k, 512k, or Plus.