Conrad's Essential Guide shows the 20' Sea-V Inboard being built in 1965, 1966, 1967 and 1968 with a total number of hulls at 220 (under the Corsair name).
The same hull was marketed as a Sea Skiff (in the Sea Skiff section of Conrad's book) in 1966 (70 hulls) and 1967 (10 hulls) making a total of 300 of these fiberglass deep-V lapstrake 20' hulls coming our of Cortland under one badge or another.
It was during the time when the Sea Skiff name was apparently being phased out, and the Corsair Division was promoting themselves as the "Sport Boat" division. From my understanding, the Cortland plant built all of the Lancers, a few glass Sea Skiffs, the Corsairs, the 19' Commander Super Sport and XK-19, the 23' Commander v-drive, and I also believe the 22'XK too.
They were indeed, cross marketing the Skiff and Corsair. The interesting thing I've discovered too, is the fact that my 1966 Skiff has the same (DetMar?) metal steering wheel as some of the earlier Thompson boats, the same wheel as the 23' Commander and some Lancer models. It has the same single stalk Morse control as the 19' Commander and XK, and the same rear clamshells at the XK-19 and several other Corsair (and Cavalier) boats. If you're familiar with Wilson Wright's RED ROCKET, you can see the same clamshells (potmetal, by the way, but good looking) on his "almost Commander".
As I learn more about the boats built in Cortland, New York, the more respect I get for them all. I see a lot of Thompson in the early boats, I see some clear Jim Wynne racing hull influence, some Dick Avery top deck styling, and it seems that virtually all of them in the 17' and larger are rather deep-V hull designs intended to perform well in rough water. The 19' Lancer transdrive has the same wetted hull as the high performance XK-19, the latter being available with V-drive or transdrive, and that makes the diminutive 19' transdrive Lancer quite a capable boat. Not many of those left, people are scared away by that transdrive, but those can be repaired and/or swapped out with Volvo outdrives. It's a shame the "transdrive scare" has resulted in many of these boats being set aside. I found one in Alabama not long ago, a very cool looking boat that ran well, but the transdrive would not raise on it's own. The guy would fix it for a few bucks, but as far as I know now, the boat is still there awaiting an appreciative and informed Chris Craft collector. They were practically giving it away.
Lots of good stuff coming out of Cortland, and some fascinating history too. This springtime I'll be driving part of that history on Old Hickory Lake, in middle Tennessee! Dale has just completed the instrument restoration, I've received windshield and clamshell hardware from Joel, upholstery is on the way, transmission still has to be swapped. A boy has to have a hobby!
Regards, all the best,