Hi.
It's a 5"x4" 4-wire resistive touchscreen by Microtouch (now 3M).
Don't have the reference number here.
I tried at that time to ask to 3M technical specifications but they just told me that this product was not made anymore, that they also have a 30$ usb micro-controller for this, but they would not sell it under 100 or so pieces.
When I asked them to give me any customer companies contact to order this usb ctl from them, I never had any answer.
That's why I thought about Arduino 
Thanx for your help!
_j