Rare vintage Microsoft Natural Keyboard, first generation

American Microsoft Natural Keyboard. Vintage, first series, from the mid-1990s. Lightly used. Fully functional. Purchased in Portugal in 1994 or 1995 from Solbi (the major Portuguese computer company City Desk in the 1990s); the Portuguese version had not yet been released. This is the American version—the very first one released. It has a PS/2 cable but requires a PS/2-to-USB adapter.