Its funny, I actually identify our age of bikes as having letter stickers or hand painted lettering rather than alloy plates, which I think of as being a late 60's/70's thing.
A quick flick through of Rockers, and BSA twin Restoration, does rather reinforce this view. Are we being a bit guilty of blinging up our Beezas?
Still, do what you want. I'm not exactly the Authenticity Police.
Cheers,
Iain