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This model is the NP (Norddeutsch Plastik) Mercedes Benz 250 in blue.
Many NP made vehicles are made from a soft plastic and often appear to be copies of vehicles manufactured by Corgi, Solido and Dinky. They have no opening parts and almost all have the windscreens filled with body material, a soft, vinyl or plastic.
This model is of the Mercedes Benz 250. It is a one-piece casting. The body lines are accurately represented and incorporate representations of the grille, mascot, head lights and side lights, bumpers, number plates (front and rear [HH 4100]), side doors, door handles, rear body "250" badge, etc.
All wheels are of a soft rubber or plastic compound in one piece shaped to represent a hub and tyre and fitted to dome head metal axles that pass through pillars on the underside of the body.
There is no base plate but the underside has "NP" and "Made in Germany" cast below what would be the underside of the roof.
This model was probably produced in the 1960s or 1970s.