Leuchtturm Dornbusch on the island of Hiddensee in DDR days

Yes, those are DDR border guards patrolling to prevent citizens from escaping the freedom of the workers' paradise to the slavery of the capitalist west. The 28-metre tall lighthouse, now painted white with a red top, was put in operation in 1888; the beam shines for 45 km over the Ostsee (Baltic). It can be visited. More info

'I like a real book'

Berlin sightseeing boat MS 'Pankow'

This is still in use -- see this page

trams and Ikarus 55 tour bus in Leninplatz, East Berlin

As it was called in DDR days, after reunification renamed Platz der Vereinten Nationen (United Nations Place).  The giant statue of Lenin was removed in the early 1990s (a helicopter transporting the head away was a scene in the movie Goodbye Lenin).

Info on the bus

Hanomag Garant truck advertisement, circa 1960

A poster by the French subsidiary, although the business was based in Hannover, Germany. This model first appeared in 1959 with a 65 hp diesel motor -- info

Berliet trucks poster, circa 1937

1927 Lagonda M45

1967 Checker Marathon

"No other car looks like, is built like, rides like" -- which may have been claims hard to challenge, but not necessarily positive ones...

1939 Bedford trucks poster

1969 International Harvester Travelette 1200C