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This model is the Dinky 25g-G-2 Flat Trailer in Dark Blue.
The model is a simple flat trailer with a sheet metal hitch.
The bottom of the model is marked with "Meccano" at the centre top, "Dinky Toys" at the centre middle and "Made in England" at the centre bottom.
All wheels are black cast metal hub with a separate white "rubber" tyre.
This item was issued between 1935 and 1940 and is the pre-WW2 version as it carries the sheet metal hitch. Post-war versions have a metal wire hitch.