Kayeff and Eureka kits came from Japan in the time frame you mentioned. If you look at some old ads for Polks in NY you might see them listed. They had a number of designs, especially large bombers like the B-50. I may have seen a P2V Neptune once but mostly they show up at MECA Collectos.

Dr. Ralph Brooke (N.Y.?) imported them, interesting thing about these kits was that most were cut/kitted in the homes of Japanese families after the war.

Polk's hobbies and America's Hobby Center both stocked them, and in 1969, I had the good fortune to fine a whole stock in Oakland, (Hobby Hut, Telegraph Ave.?)

I have an F8F Bearcat, in the familiar heavy brown cardboard carton: It is labeled with 'U-CONTROL', .29-.35;  there were others with the same label, 'U-CONTROL'

Skyraider, P51 Mustang, Corsair, and the multis: B36, Connie, B24, B25, Bamboo bomber. (wish I'd grabbed that one!)

These would build heavy, (I had a Zero, it weighed almost 5 lbs.! But it flew...) the wood is like a 'gummy' basswood, but easy to copy in balsa. It is like buying a kit with patterns for everything.

If it weren't for Keith Trostle's help and Al Rabe's Bearcats, I would have built mine from balsa, and been happy...but thanks to these fine gentlemen, I am now spoiled and know too much! (grin)

But when I find a chance to buy these Japanese kits, I jump at it. They are magnificent in my memory of what truly 'deluxe' kits were.