(1961, James Cagney)

“Last night I saw a 1950s black and white comedy about the Coca Cola manager in Berlin; some doubledeckers can be seen in the background a couple of times.” (a mystery from Carlos Wallberg solved by both Alan Aron and Scot Fergie). They're Büssing D2U “The very last scene shows Cagney putting money into a Coke vending machine and getting a Pepsi” (Alan Aron)