I think my pre-Anniversary is brass, it's in the UK, so I can't check at the moment - I'm currently in Turkey. Mines non standard though it's not a folder, it started life as a special for wide-angle use.

Maybe I should try polishing up the brass work, I'll look when I go to the UK in a couple of weeks.

I bought 2 old very tatty Speed Graphics sold as a pair to make one good one, the seller neglected to say they were quite different, almost nothing is interchangeable. The 2nd an Anniversary Speed had no shutter so I filled the holes in its side and have now recovered it.

Both my post Anniversary Speed and Crown Graphics have aluminium rails, as far as I know from the Anniversary models and onwards they all used the same trackbed rails etc.

Ian