Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
My understanding is that to be period correct, b&w plates ceased some time in 1973? However DVLA does permit b&w plates for vehicles up to 1980. Personally I prefer to see things as being period correct, but guess whatever floats your boat will do.
I think one of the advantages of the black and silver plate is it ensures those following realise you are not on some modern day pocket rocket especially for the smaller classic bikes. I have definitely noticed fewer people get up your backside since fitting to my 550. I think in particular it kind of shocks youngsters into wondering 'what the hell is that' not being familiar with the plate