My Rees Mace speaker is exactly as shown on 'The Radiomuseum' web page, the dark brown one,
https://www.radiomuseum.org/r/rees_mace_speaker.html
a glossy mottled/walnut/tortoiseshell finish? ( I don't know the correct name ), if they are from the mid '30s would they have painted them? I wouldn't think so, wasn't everything brown in that era? Mine came without the original speaker.
John