Colin, you are correct and Jeffery is mistaken... the Contax 3 pin off camera accessories do maintain TTL... but that's all.
As I've mentioned previously, the TLA 360 and it's accessories are in need of updating. A camera as sophisticated as the N1/ND and C645 deserve a more advanced dedicated TTL flash system like that of Canon.
High speed sync, multiple flash radio slave capability, focal length/distance communication when off camera. BETTER built shoe at the bracket end to secure the TLA flash.
QUESTION: has anyone tried the Nikon off camera TTL cord
with their Contax N and TLA 360? The Nikon unit is one of the better made, more rugged ones on the market. I believe the TLA360 was a Nikon designed unit. I also know that with Leica you can use either Contax or Nikon off camera cords. Also, does Metz make a better C/Y dedicated off-camera cord with a beefy shoe at the bracket end?