NSK bearings are Japanese, unless you're buying knock-offs. I just inspected a 62 last week that had a problem and it ended up being a busted shield and marked MADE IN CHINA. The measurement with the wire means you would lay two pieces, one on each side of the groove the caliper jaws will touch, to get the overall diameter of said pulley. Don't know who made the rule, just know it as a machinist student.