Fully tested,Apple, two colour beige and smoke brown M0100 mouse used on the original Macintosh 128K, 512K and Plus. This is the revision 2 model manufactured in Japan which had a smaller rounded DB9 connector with smooth finger screws, and two screws in the base. Although still in good condition, this B-grade item may have some noticeable yellowing of the plastics or moderate blemishes.