The hand wheel itself is cast iron. The allied scale is aluminum.
Im not sure yet if I’ll replicate the scale in a engraved aluminum or brass to match the rip fence scale.
The fence on my T54 jointer has a small scale for the bevel of the fence. It’s a thick aluminum engraved with the scale and numbers painted black. It’s pretty slick as the scale itself is a brushed aluminum. I may opt to replicate it over the brass. After all I am trying to keep this thing original minus the various bits and pieces I opted to nickel plate that were previously just painted.