When I moved into mine some 42 years ago, all the earths were in black sleeving. It took me a fair bit of time to sort out all the neutral - earth cross connections.
German appliances around the 1940's use Red for the Earth conductor, The Brown earth wire could have been originally Red that discoloured to become brown.
When I moved into this house one socket had a piece of black sleeving over one earth wire and a piece of red sleeving over the other earth wire. Whoever installed it apparently didn't have any sleeving and just used a bit of red and black stripped off the line and neutral.
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