I think I have you all beat but how do I find out the age of a Hobie?

The Hobie 16 Hull number 1279 is stamped on the plyon posts and acording to the web site that makes it a pre-1973 model but I am curious of the actual year of manufacture.

Also having trouble registering it because the hull does not have a number other than 1279. (Registration required to put the boat on the beach in NJ) Any advice appreciated.

For reference, the boat is pretty close to new condition except for a little gel coat fading and a few loose rivets.