Had a fair few of these pass through my hands, like most of us, over the years,,,,but never seen a factory anodised one.
Checked back through my 80's Redline Catalogues and not seen any mention either...
![Undecided :-\](http://www.radbmx.co.uk/forum/Smileys/smilies/undecided.gif)
That's not to say there wasn't some made mind....