Henry Plain appears to be attempting to sell his collection. This time, a mouse is up for sale ($1,875). It’s a transparent DE-9 mouse (using quadrature encoding), a gimmick commonly used for Apple prototypes in the 1980s.
Indeed, loyal readers may have already seen this mouse.
![](https://www.journaldulapin.com/wp-content/uploads/2017/11/s-l1600-10-850x638.jpg)
The transparent mouse
![](https://www.journaldulapin.com/wp-content/uploads/2017/11/s-l1600-1-2-850x638.jpg)