Have you noticed the variation on the MK.111 liners made in the fifties I have a 1945 made example the same as yours were the lift the dot system is in the middle of the cruciform were as the fifties made ones you lift the whole cruciform to remove the liner, the pictures show two liners by the same manufacturer FFL, Fisher foils Ltd. With 1945 date and a 1952 date, I can't find any reference material as to wether we should regard the later version as a MK.111A as it was obviously still regarded as a MK.111 because it was followed by a MK.1V.
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