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This model is the Triang Minic 3099 RAF Tanker Truck in RAF Blue. This item is plastic and has a flywheel friction drive.
The model has a diecast plastic body. It has been shaped with rudimentary representations of the body lines. There is no glazing.
The original black plastic front wheels are still on the model, mounted on a plastic axle. The rear driving wheels appear to be rubber, attached to a steel axle that passes through the friction drive motor to power the vehicle, the flywheel being mounted inside the body.
There is no base plate. The underside of the casting carries the legend "Triang" and "Made in England", the friction drive has been press fitted to the body and the plastic body pins melted to hold it to the body.
I do not know exactly when this item was issued but believe it to be between the 1950s and 1960s as similar civilian vehicles are shown in the 1957 Trade Catalogue.