Those two are the oldest and newest I know of. Is yours a 74 or 73 (last number in your serial on the transom). That's a great price for a 79 with a trailer if everything is in good shape. Plus a fresh water boat. I wonder if they were produced into the 80's? I think Jack Helms made his other models into the 80's.
I think I'll kid my wife and tell her I found a 79 Helms 25 and want to upgrade. Road trip! I don't know if you remember, but I drove from Philly to Ill to by KJ. How did you get Craigslist out of your area? Is there a national listing for all states?
Rehoboth Bay/Indian River, DE
S/Y KJ, Helms 25