These two key rings are probably from the 1960s, they were part of the items from Michael Birds MG J2 parts collection in Cyprus, passed on to me by his widow.
There is a pic of a whole load of key rings in Mike Ellman-Brown's book 'MG Collectibles' (long out of print) but it is not clear which comes from when.
The Register of course offers a very presentable key ring of its own!