Very nice! Congrats on your machine! Check out this blog.
http://www.doubleveil.net/zssmp/reversew.htm Zorba has a lot of great info on National machines.
I've determined my 3/4 size Montgomery Wards machine is the Expert B/T. Mine doesn't have the snazzy Art Deco cover on the nose. I'm up to 3 National made machines, all Montgomery Wards brands. The Expert B/T is a Brunswick, my full size rotary is a Damascus and the Streamliner that MacyBaby gave me is Montgomery Wards. I want a Reversew Rex too to round out the set. It also doesn't help that I have a real weakness when it comes to anything Art Deco.
I just finished rebuilding the rubber drive wheels on two of my Nationals. If you need help with yours just PM me.
Rodney