The frequency doesnt mean shit. This is a multi format TV. I live in Australia, so no, i have not got a US spec one. I used to own a Panasonic GAOO that did both 50 and 60 Hz, and now own an NEC and a Sony ( both CRT video projection systems ) that will do any scan rate you throw at them up to 160 Hz.
You can rest assured that what i have told you is correct, and test it for yourself if you like. If it doesnt work we will know i was wrong, and youll be no worse off at all. But dont hold your breath, cause i wouldnt be so sure if i didnt know abit about TVs.
RCA was sold in Europe as Thomson, and that is why your set is sporting a SCART socket. They were not marketed in Japan, cause they would never compete with the likes of higher quality Japanese made sets like those from Panasonic, Sony, Mitsubishi, Hitachi, Toshiba, JVC, NEC, etc...
So you dont need input from someone that owns the US set, cause i would almost bet that the only difference is the power supply and the emblem on the front of the set, and even the power supply might be 100-240 volt capable. RCA/Thomson is not a brand that was known for quality without compromise, so it is very fitting that they made the same set for multiple countries. Nothing wrong with them, but they are only really one step above generic.