Ryder, one-offs, see my post above. Horrible things, but at least it shows somebody has a sense of humour. As DSJR rightly observes, chrome doesn't take well to such a casting.
I recall there was also a one-off NAC552 with a silver fascia (not chromed, just not black anodised) made for a dealer to match some other gear he had. I couldn't help but feel that it just looked wrong.