The Mk1 chin strap was first used in 1937 on the Mk1* helmet, but due to the Mk1 chin strap lugs & the large wire loops on the end of the chin strap it kept slipping off.
Some months later in 1937 the Mk2 chin strap & Mk2 chin strap lugs replaced them.
From then on until economy measures came into play when the Mk2 chin strap was replaced by the Mk3 chin strap in 1941.
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