Royal Armoured Corps QC beret badge

[Royal]

An indulgence from those more expert than me!

I aquired the beret badge below together with a few other naval odds and sods (not sure why they were together!).

Its well outside my areas of expertese and interest but has piqued my curiosity.

Is it genuine and if so from what era, what parts of the RAC wear the badge - and on what colour beret?

Many thanks

Gyp