Thanks, Steve.

I just found the right serial number, it was made in 1965 according to the serial number. I am surprised that there was no obvious dings and scratched on it for over 40 years. the case looks pretty old though, the handle was broken. but my son is happy with it, and i am happy with it.

Thank yo all again. and good night all.

<Added>

Well, I was told today that the first Omega was made even after 1965, then I don't know when it was made.