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As smoking habits changed and pocket sized packs became popular, 1lb tins were gradually replaced by smaller tin sizes which in the main did not require ventilation holes, although there were exceptions to this such as Digger Flake and Erinmore Mixture which were available in 2oz ventilated tins in the 1950s Unfortunately, the presence or absence of air holes does not give much if an indication as to the age of a tin as the ventilated tins were phased out very gradually over a long period of time

Elias, J

Through such procedures as air opening, screw opening, gluing, packing and rolling, side sealing shaping and cutting manufactures the filter rods of equal length that comply with the requirements for butting

C., Pollack, M

Then the picture became both darker and clearer