He translates the description of the film as:
He was sent by train in a 20 cubic meter crate. It took two days from Hamburg to Basel. He was only there for a visit, but became a big attraction. He weighed in at around 3 tons, was 4 meters in length, and ate 50 kilos of herrings a day while in Basel. You will see him "catching" a few from his trainer in the video. It took 10 men, some winches and a tractor to transfer him from train to wagon to zoo.
This photo was taken in 1975 in the Berlin Zoo. The caption translates into: You don't get to do a tooth check without a bribe of some sort!
These photos are remarkable -- for the familiarity the humans have with the seals, and for the fact that the seals survived at all, apparently healthy and content. I plan to research this further and see what I can learn.