Decca 'Trench' - Copper 'Reflector'

[poodling around]

I wonder, were these copper 'reflectors' made from solid copper or was some form of thin copper coating applied to steel ? (I assume they were copper and not brass).

Also, does anyone know why these copper 'reflectors' were made in the first place ? Were they featured only on original 'Trench' models, or did they only appear on more expensive models maybe ?

Thank you for any information / advice.

Ah, I have found the answer, thanks to Oedipus !

"only the brown models had the copper-plated bowl".

viewtopic.php?f=11&t=48293&p=286406&hil ... ch#p286406

Very interesting indeed.