I hope you are not suggesting that all the Fairey Overdrives had the window and Archimedes screw device?
Because if you are and I can get this camera to talk to this dud computer I'll show you a pic of a Fairey O/D from a SIII without the window right now ( just went out to the shed and took a pic). If you can wait until the weekend I'll also show you a pic of one from a LT95 Fairey without the window and Archimedes screw.

