OS/2, Ecomstation & Arcaos - Microsoft Mouse for DOS & OS/2 from 1990, strangely enough there is no mention of MS Windows on the package at all. https://www.ebay.co.uk/itm/Microsoft-Mouse-PS -2-Version-Serial-interface-included-for-DOS-OS-2-Systems ...
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IBM PS/1 Used 486DX2 DOS Windows 3.1 Computer Floppy CD-ROM Drives 420MB HD 4 MB | #1846220871
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