Hello John,
These collar badges were worn in brass from 1930 until 1940 by other ranks of both the Militia artillery and the Permanent and Militia elements of the engineers. In December 1939 they were directed to be blackened and in early 1942 their wear was abolished entirely.
Between 1930 and 1933 this badge was also worn by other ranks of the artillery of the Permanent forces in brass.
Keith
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