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Wartime Pool petrol supplement.
Supplement to be used with wartime petrol with the claim \'20% guaranteed increased mileage\'. The product is in fact mothballs! Repackaged and branded as \'Grundy\'s Petroids\' this naptha based additive comes with a copy of an extract of a 1940 edition of the \'Autocar\' endorsing \'Petroids\' which came in the box. In excellent condition, slight crushing to the box, an unusual souvenir of wartime motoring.