Correct. It's made in Germany and German sold it to Chinese in 1930s. Half a century later, it's exported to US in 1980s. But I bet it's rebored and reblued in the US. Chinese would not rebore it to 9mm because standard Chinese caliber was 7.62x25 Tokarev. Unlike Soviet Union or East Germany, Chinese did not have routine gun reblue program either. After import, a US owner hired a gunsmith rebored it and reblued it, due to original 7.63mm bore was in poor shape and it's rusted. It was a popular practice among US gun owners.
I just noticed there was a gun in worse condition sold $1500 just a week ago.
http://www.gunbroker.com/Auction/Vie...Item=462352794