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This model is the AHI Diamond T Construction Tractor in green. It comes in its original AHI branded box. It is a copy of the MB15-a Diamond T Prime Mover.
The model is a single piece metal body, 48mm in length (including tow hook). It has been molded with the cab and chassis casting having representations of the grille, bumper, windows, and doors cast at the front, and the rear casting represents the rear deck. There is no glazing. The original wheels are grey plastic and attached to steel axles with a domed end and a crimped end. They are held to the body by means of short columns or cast areas through which the axles pass.
There is no base plate as such and this cast toy has no manufacturer's marks but does have country of origin (JAPAN) cast on it.
I do not know exactly when this item was issued but it would have been during the 1950s and 1960s.