The German Gun Collectors Association has a 80 page 1914-1915 “Franz Sodia” Catalog available for purchase. Click Here to go to their site and to view thier offerings.
The following two images were found in Dietrich’s archives and were from Mr. Al Rickli. They show a Franz Sodia pre war Drilling serial no. 970 proofed in 1941. It has side plates and is 20 ga. x 20 ga. x 22 Hornet.
The following images are courtesy of the Auction House-