Please refer here to Colin Owen under his Badge No.3976.

Here we have a more modern Cap Badge ........... SERVAMUS ..........It was worn at the South African Technical Services Centre and as you can see has a Red Plastic Backing over Brass and Chrome Finishes.
"Quartermaster's Comment":-   It has 'Screw' Fittings and was worn between about 1984 through until around 2000.