I'm unsure of the exact date but I think it's from 1959-1969. The (Swiss) case appears to be solid gold, unsure of the purity. There is a mark at the top of the case which reads 40 with an LL hallmark. The dial has some corrosion that is visible in the picture but not clearly apparent to the unaided eye. The watchband appears to be the original, gold plated Speidel Twist-O-Flex with a little wear on the edges. This was my grandfather's watch, he lived from 1913-1996. This watch was given to me in 1999. It runs well, and I wear it on occasion!
Case Serial No.