Thanks for the reply.
The weather is poor here today, but I will post a pic asap.
If the window is fixed, (and a factory top) it would seem that this one has been replaced. The plastic does look very clear to be the age of the car.
Please do post some pictures. It would help greatly with this mystery!
It's not what you buy, it's what you build- Unknown
EN90283 - Stabled for HG repair
DH06247 - Running like a champ