I have used design software to create a pattern as close as possible to the photo image. The pattern has a small border which I estimate to be 0.75". There are 5 distinct circles which I estimate are 3" diameter; the centre section is clearly a different colour or texture from the remainder of the window which is clear glass. This centre section may be textured and opaque.
If anyone can remember the original window and can remember the colours, I would be very grateful if you would let me know.