Manfred Urban was a German Company, producing cheap plastic toys at the time Germany was going through it's 'Hong Kong' moment, they produced the whole gamut; 54mm toy soldiers, figural pencil sharpeners, premiums for confectionery companies etc...
There is a forth tank, a Russian one, probably a T54/55 and the various chassis were also used for some space vehicles. The US tanks are about 1:72. the Panther is small next to the
Airfix ready-made, The track unit on a space tank marked 'Russian tank' is also on the small side for a 'T' series so both about 1:87th a popular 'Euro size'!
All the military vehicle range were issued in a dark green, olive green (and most shades in between!) and also silver. Sometimes they are marketed under the
Dom trade mark, while in the UK they appeared in
Tallon branding as a 'pocket money' or rack-toy. Sometimes wheels/tyres are pale grey or charcoal rather than black.
The large scale (approximately 1:72) truck is - I think - based on the post war
Jupiter used by the Budeswher, the little trucks ('N' gauge) which had a range of different rears/loads were more fictional.
This is a classic matchstick-firing gun mounted on something resembling a Mercedes truck, with a simple pull-back action it would keep a young you amused for minutes until the polystyrene gave, broke or came apart somewhere!
Other items which with the exception of the 'trench mortar' (rear right) are
Manurba, the other may be; I've been told by a German collector that he thinks it is and it's certainly the sort of thing they would make for gift bags or some such. The Jeep and trailer are a bit on the big side for war gaming, the little gun (rear left) also fires matchsticks