Here are two wonderful old photos of Dobermans. These were found at this forum link, http://www.dobermantalk.com/doberman-related-chat/1923-history-dobermann-4.html
In the first photo, you can see 3 well-trained Dobermans and one stubborn Doberman waiting for a treat.
In the second photo, according to the forum poster, ” shows 2 Dobermann v. Radeland back in the 50’ties, advertising for a dog show in Berlin.”
It would be nice to see all these vintage photographs compiled into one beautiful reference book.