A hundred horse outboard on that boat must be positively wicked! I learned to water ski behind a 35 Evinrude hooked to an alminum DuraCraft, and the "Blue Bomb" weighs more, but not that much more!
I have the identical nose light hardware on my 1966 20' glass Sea Skiff, and I noticed your Corsair has what I call a "raised nose rail" that I also see on a very few of the early 20' Corsair models. Later Corsair Sea V models didn't replicate that raised nose, and opted for the more flat profile I have on the Skiff. Just one more obscure detail in topside castings from Cortland, NY.
I saw your note about the "what's this about the Thompson/Chris Craft"? That's really part of the fun with these boats. I think the mahogany runabout scene is pretty well documented, on some models every surviving example is known and tracked, but with these "modern classics", I think we are just seeing the tip of the iceberg as far as interest, collectability, and appreciation. Congratulations with yours, hope is gives you many years of good service and fun.
1956 17' CC Sportsman, 300-hp
1957 17' CC Sportsman, 95-hp
1966 20' CC fiberglass Sea Skiff, 210-hp+
1973 23' CC Lancer inboard project, 427 power.
1966 38' CC Commander Express, 427/300-hp(2)
So many boats.........so little time.....but what a way to go!!