NRU74
ian16th
Wasn't the J/T upturned chevron replaced with a kind of brass 'wheel' and the Chief Tech's crown likewise ?
Originally a Chief Tech wore 3 chevrons, point up, and a crown.
As Ricardian said, the new J/T's badge was a 4 bladed prop, the new Chief/Tech's badges were 3 chevrons point down and the new J/T's 4 bladed prop above it.
The 4 bladed brass 'wheel' always was the Boy Entrants and Apprentices badge. I never heard of it being used anywhere else.
This is my 64 year old one.