The box shown here is for the Dinky Toys #935 Leyland Octopus Flat Truck with Chains model in the Yellow & Green finish.
It is a 'Supertoys' style, lid & base type yellow box.
All colour finish variations of this model were originally issued in the same box. Models finished in Blue & Grey were originally supplied in the same box as the Yellow & Green models but with a small round blue 'sticker' on the right hand end of the lid.