C16R was the Clockwork with a different name, so 'entry level' steel frame sold along side the P7 although the 'entry level' bit is debatable.
Your alloy forks are likely off an Elite or 'O' series bike though cos the C16R had steel or Rockshox (in C16RS guise).
You sure? Mine are one inch, cut specifically for the C16 frame I had - FIR rims, STX headset, STX / Alivio mechs. I transplanted the front end to the Fuji below donating the 1" Ahead Manitous to the Orange:
Yup. reasonably sure. The C16R came with F7 forks as standard from early on. There was never an option for alloy forks, but there could be a couple of explanations for yours. The E3 had the same geometry as the C16R and also sported a 1" threaded fork, so the forks from an E3 would fit straight onto a C16R.
The other option is that the alloy forks were probably available on their own, so it's possible they could have been spec'ed as an upgrade from new, although, as I said, this wasn't a published option as far as I know.
WANTED: RS Mag 21 with 1/18" unthreaded steerer | USE Stealth forks or spare parts