What you're looking at is just the Iakos and amas. With Polaris canoes, they got all kinds of set-ups. I first had the Bixler (new pegasus ama)set-up where the iakos were bent and the ama basically pointed to the sky. I now have a set, same ama, but with iakos less bent not looking so drastic causing less drag. I heard that most of the good guys prefer the waveblade ama which is more of the traditional style. They say it's a bit stable and has less drag in the water and wind resistance. Yet, I believe Kai will be comming out with another set-up soon. So basically you can't tell the years by the set-up, for guys are mixing it up to thier own preference. The only way is to ask the owner. Good luck finding the right one for you.
By the way, the Polaris is a great rig.
"It surfs like a MO FO"!

Aloha!