The German Gun Collectors Association has a Greifelt & Co. catalog reprint available for purchase. Click here to go to thier site and to view what they have to offer.
Below- we have close ups of the guns previously mentioned in Dietrich’s article.
Below is a close up of a Greifelt side by side, source- Dietrich’s files
Below is a gallery of photo’s of a mint unfired single shot falling block Greifelt rifle in 8.15 x 46.