Thanks for the comments.
These badges where obviously unpopular, and didn't 'look right' on the fur cap. They where certainly replaced fairly quickly by those Ind/Pak ones, we've seen previously.
Therefore, surplus to fur cap requirements, the Regiment (or QM more like!) being frugal would certainly have reused them if at all possible and as Graham states, where better than on the Pioneer apron. Makes sense to me.
Either way I'm happy it's mine!
The badges in use in 1 RRF in the early 70's were dies-truck yellow metal, the heavy, crude, cast ones with a copper sheen when new, they were made in Pakistan & shipped to The Tower (where I was lurking for a few months) about January 1980, along with hackles in the colours of the old component regiments & officer's gilt & silver coloured bearet badges of the same size & design as the anod. aluminium beret badge.
I got a few of the Drummer's badges at about £1 a time, hackles at about 25p a time, but never got my hands on the officer's beret badges at £2 a time - I asked, Col Connelly did'nt say no, but the matter was tactfully dropped.