I'm not what you're asking, but I'll try to answer.
The RG 450 is a Korean made guitar, and I wasn't aware they made one with an ash body (I could me mistaken though). I thought they were all made of basswood.
The RG 5XX's have always been made in Japan, and they are superior to the Korean made guitars.
The only RG's that were completely made in the USA were the American Master series. Go here for more info *
http://www.jemsite.com/usa/usa.htm
I own 3 Japanese RG's and I've been very happy with them.