First, let me correct a bit of misinformation. Singer didn't give anybody anything. Other countries were building round bobbin machines long before WWII as Singers patent on it had run out.
The 70s and the 90s brought the official "nostalgia" Singer reproductions to the US and they were built in China, Taiwan and I think somewhere else. I own a Brother nostalgia machine, a hand crank 15 class from 1976. 15 class knock offs have continuously been built in countries around the world this whole time, they're still being built.
Cari