Worked for Fox Mfg off/on from Aug '70 to Oct '75.
Bucy Die Casting of California did the casting work.
"99% of their business was for the ;US Gummint. 1% toy airplane motors."
Not even close. During my early years at Fox, Duke was still machining parachute loops and bomb pieces, as the Vietnam war was winding down, but at its height, the government work under Duke's leadership was no where near 99%. Duke had his faults, but he was staunchly pro-American mfg'ing. (Can you blame him?) There were small contracts up to the end of my years at Fox, but the vast majority of Duke's productions during my years there were model airplane engines, accessories, supplies, fuel, etc.
I can assure you that there were NEVER any engines, or even engine parts, made overseas. The only parts NOT made in-house were the casting parts. Aside from the raw castings, we machined (including the raw castings), honed, ground, assembled stuff WE made in house.
Make no mistake, Duke had his faults, but he was pretty darn good at designing durable engines that performed for their intended purposes and were affordably priced.
Andre