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This model is the Dinky 760-G-1 Pillar Box in red and black.
The model is a one-piece metal body molded with representations of the clearance times board, slot, and door emblazened with "ER". The rear of the pillar box carries the legend "Dinky, Toys, 760, Made in, England, Meccano" on6 lines.
There is no baseplate and the inside of the casting is unmarked.
This item was issued between 1954 and 1960.