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This model is the Dinky 551-G-1 Large Open Trailer in Dark Grey with Red hubs.
The model features a dark grey cast trailer body and chassis with a separate black front axle casting.
All wheels consist of red ridged cast metal hubs with grey rubber tyres. 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 and "Made in England By" in tiny letters on line one, followed by "Meccano Ltd" in larger lettering on line two at the front. There is no model number on this base. 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.