Andy, I have never seen any of those alloy reels with anything but nickel silver for the line guide where it is in effect a mount for the agate.
I have seen some very early brass faced Perfect’s with a brass line guide and some early alloy reels with a solid brass line guide as well as some/most with a nickel silver guide.
But on the later alloy reels they came with either a solid nickel silver line guide or with agate mounted in NS and much later with a some sort of brown ceramic? instead of agate.
The reel foot is either brass or alloy, the cage and spool are machined die cast aluminium. Hardy’s had their own foundry to make the castings.
John