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This model is the Jacky Manufacturing (HK) - Copy of MB64b - MG 1100 in light blue plastic.
The model has all detail cast into the main body casting. No attempt has been made to highlight any part of the model. There is no interior, glazing or base, however the underside of the roof is marked "Jacky, Mfy.Ltd., Hong Kong" on three lines. The wheels are an all-in-one, black plastic unit comprising both wheels and axles. The axles are held in columns protruding down from the body casting and are simple pressed into place.
Probably issued in the 1960s or 1970s.