Here is a set that I used to have. This is a 1951 Zenith H2250R 12" porthole. The set was a basket case when I bought it. I have a webpage up showing the restoration:
http://www.angelfire.com/electronic2...R/porthole.htm
I ended up selling it when I bought a 1950 G2350. You can browse around my page and find another page on the restoration of that set.