Wartime No5 Cleaning kit brush?

[Mk VII]

You needed to differentiate between the tins so that someone didn't end up with a 303/SMG pullthrough, which won't work in an SLR, also they would deficient of the tool. So they would often be marked on the outside.

The crooks-and-nannies brush was overwhelmingly nylon by the 1980s but you still found the odd wooden one - I've got one here which somebody dropped on the range 30 years ago (gear adrift, must be a gift ...)