Davey here.
The C2 is a Prijon Queen Mary design, same as Ron Lugbill and I paddled in 1977 World Championships in Spittal, Austria to win the C2 Team Bronze medal for the USA, first WC medal I ever won! We built it using free Kevlar from DuPont, and also raced it in 1978 to win the Pre-Worlds at Desbiens, Quebec, the wildwater venue for the Jonquiere, Quebec Worlds. Ron and I finished 11th in it at the 1979 Worlds on the same race course.
The stripes look like what Apple Line used for boats they made around 1981. Any idea where it came from? Any labels inside the boat? It might have been used at Bala Wales Worlds in 1981. Apple Line made a lot of boats for the US Team that year.
The cockpit configuration is interesting. The spacing is quite large, making it more like an end-hole boat than a center cockpit setup. Looks like the original offset cockpits were much closer together, as was common after end-hole boats went out of fashion in '75-'76
The C1 looks like a Roock-Schmidt design, like I made one of around 1977-1978 or so, but it could also be an Ace or Ace II.
These are both fast boats!
BTW, the cockpit on the yellow C1 is made of Kevlar Carbon hybrid fabric, available here: (unashamed plug)
http://www.sweetcomposites.com/Kevlar.html#G" onclick="window.open(this.href);return false;