This white plastic mouse has a roller ball, four buttons, and a coiled cord. There also is a gray plastic and metal piece that could be used to hold the mouse to the side of a microcomputer keyboard. An additional cylindrical piece, which allowed one to roll the mouse so that it stayed at a desired angle, apparently is missing. Everything fits in a black leather case.
A mark on the back of the mouse reads in part: Microsoft BallPoint mouse FCC ID: CeKB (/) Patent No. 4,866,602 Patents Pending (/) PIN: 13340 Made in Japan. Patent 4,866,602 is for a form of power supply.
There is a black leather zippered carrying case marked: Microsoft. It also is marked: Part No. 13342 (/) Made in U.S.A.
U.S. Patent 4,866,602 was issued in 1989. Microsoft received a trademark for the term BallPoint , as applied to computer peripherals, in 1991 and first used it in commerce at that time.
For informaion, see https://www.microsoft.com/buxtoncollection/detail.aspx?id=224.