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This model is the Dinky 40b-G-2 Triumph 1800 Saloon in Tan. I have catalogued this as the 40b version without the cast rear axle pillars although it could just as easily be the early 151 tan version listed in the Richardson's book (pg 60, "The Great Book of Dinky Toys" by Mike & Sue Richardson, published 2000 by New Cavendish Books [ISBN 1 82727 83 2]).
This model features a single piece cast body with separate cast headlights (originals still on this model but often missing from the models after all these years). The body casting has no internal rear pillars — the axles are held in place by tabs on the base plate. The entire body is painted tan with the grille, headlight lenses, and bumpers picked out in silver. The wheel hubs are of the cast ridged variety and are painted a light green. There is no interior or glazing.
The base plate is lacquered tinplate metal with a blackish tinge. It is marked with "Dinky Toys" at the top centre, "Triumph" in the middle centre, "Meccano Ltd" at the bottom centre, and "Made in England" on three lines over the rear axle.
All wheels are black rubber tyres on light green cast hubs fitted to steel domed, rounded axles.
This model was issued between 1949 and 1953.