The correct English, French, and German designations of SIG P210 parts can be found
here, accompanied by my notes on their fit, function, and variations.
All inbound foreign gun parts shipments containing rifled barrels and/or valued at over $100.00 are subject to import licensing by the BATF. In my experience, these regulations are enforced vigorously but fairly. Violate them not only at your own risk, but to the common detriment of your fellow enthusiasts. All in all, a new old stock SIG P210 barrel offered "for about 1/3 the cost of [your] entire pistol, purchased in mint condition", is not a bad deal.