New collector, New gun, and odd grips!

[byf42]

I am new to this wonderful world of Lugers, and I recently found my second addition to the collection. I hope someone can help with questions regarding this BYF42. I purchased from a veteran's estate sale and obtained the capture certificate, the customs declaration, the brown leather holster, 2 FXO black plastic bottom mags, and a set of wood grips. Now that I have rambled here is the part which puzzles me: The gun has clear plastic handmade grips. The safety side has a piece of red cloth under the grip with a picture of an attractive female on top of that. Obviously you can see her through the grip. The other side is just transparent to see the inner working of the grip. I was told by someone that it appeared to made from an airplane canopy. Also in the holster was a green cloth with german type on it, and the date 1940.(the holster is 1940). I was told by the family that the vet told them he took the gun and holster off of the german and in the german's personal belongings found the wood grips. Is there anyway to find out if they are indeed made from an airplane canopy, and was there such a thing as a "cleaning cloth" issued with either the holster or the gun? I am going to try to post the pics, but the key word there is try... P.S. I am afraid to remove that grip side with the picture for fear of destroying the picture and forever altering the "uniqueness" of the gun....