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This model is the Dinky 551-G-2 Large Open Trailer in Dark Grey with Maroon Supertoy hubs.
The model features a dark grey cast trailer body and chassis with a separate black front axle casting.
All wheels consist of black rubber tyres on maroon cast metal hubs. There is no spare wheel on the underside but a tinplate tow hook is attached to the rear of the trailer body.
The base plate is actually the underside of the front steering axle arrangement. It is painted black metal with Dinky Supertoys towards the rear of the trailer followed at right angles [90 degrees] by "511" underneath the axle itself and "Made in England By" in tiny letters on line one, followed by "Meccano Ltd" in larger lettering on line two. The casting also has the wire metal towing drawbar fitted to it with the ends of the wire passing through small cast holes and crimped on the outer ends. It is fixed to the body casting through the use of a machined rivet.
This model was issued between 1948 and 1954.