I believe there were three basic variations Marc - KC/yellow background, KC/khaki background, and QC/khaki background. The lion on the Royal Crest appears to have retained a KC throughout (although I have had one KC/khaki variant with what appears to be a QC on the lion, probably a manufacturer's slip of needle). Offhand I think those series of badges were introduced in 1951 and are certainly mentioned in SO Dress 1952.
Keith
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