I believe this is a 600, circa 1954. See picture on this page:
http://members.aol.com/tcsopr/transoc.htm
The model number should be stamped on the chassis.
I recently restored a 600 just like the picture for a friend. It had sat in a closet for years. I didn't have much to do on it cosmetically: a little black Sharpie and some black shoe polish and the case looked new. Then a little Windex and the rest of it shined up.
Recapped it and put new electrolytics under the chassis, using terminal strips. The chassis is kind of tight in spots underneath, so take your time and double check every move you make. A couple of the tubes are getting expensive and you don't want to burn out the filaments. This set was operating, but I also replaced the selenium rectifier with a couple of silicon diodes in series, and a further dropping resistor to mimic the drop through the selenium. If a selenium goes, it stinks up the house big time.
One thing to remember on these that once it's going, never pull a tube and then reinsert it with the power on. With the tube out, the filters can charge up and then let go through your filament string when you plug the tube back in. Always turn the set off before changing tubes.
Once recapped and the alignment and IF's tweaked, it's a great performer and picks up plenty of short wave.
There's more here:
http://bellsouthpwp.net/p/a/padgett46/tohome.htm
Reece