Thanks for your inputs Gordon, Joe and Michel: I have uploaded a shot of my Carl Zeiss Jena made sunglasses. Since I started this topic, I scoured my U-Boat books and remembered some good photos of crew members wearing what appears to be the same model sunglasses as the Carl Zeiss model as shown in my picture. The photos appear in Jak M. Showell's excellent book, "Wolfpacks at War" on Pages 12, 13 and on page 62 there is a clear, close up photo and a description of the use of the sunglasses. Thanks again for your attention and interest! Regards Neil B.