Royal Armoured Corps (RAC) Training Brigade Insignia
Post WW2 combination (these items came together) as worn by the Royal Scots Greys (2nd Dragoons) when part of the RAC training brigade. The blue slip on presumably a company designation. The red triangle as worn the the RSG.
BoBD (Jon Mills) page 916, para 5 refers.
Comm FB
Code: 64692