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This model is the Matchbox Kingsize K3-A-2 Caterpillar Crawler Tractor in yellow, most usually found with the K8-a Laing set.
This model has no opening parts. At the front is the cast grille in yellow, engine housing in yellow, engine in red, and to the rear is the driver's seat in yellow. All detail is cast into the body — top hood panels and body side panels, fuel tanks, seat and small rollers.
There is no interior as such beyond the driver's seat. As with the real vehicle, there is no glazing.
All wheels are cast metal, single piece units on steel axles. The rollers are enhanced by a green rubber track.
The base plate is yellow painted metal and is marked with Matchbox Series, King Size, No 3 on three lines, to the front of the base, below the engine, at right angles to the axle, and "D9 Caterpillar, Regd. Trade Mk., Tractor," on three lines to the top centre, and "Made in England, by Lesney" on two lines to the rear, all at right angles to the rear axle. It is held in place with a single machined rivet at the centre, and a single split rivet at the front.
This model was issued between 1960 and 1967.