The Mauser was Nationalist Chinese issue - contracted straight out of Germany.
The Chinese did manage to copy them - and even in .45ACP, because of US military assistance.
They were imported in the thousands, back in the '90's and there was a cottage industry in existence that refurbished them - including Federal Ordnance - so they vary in exterior condition, with a lot of bluing over pitting, re-machined frames, new barrels, re-lined barrels, new wood and leather, and in some cases, brand-new markings.
If you're going to own one, it's best to buy (and actually read for content) the reference works available before you un-limber your wallet.
Scouts Out!