Top one is a National NC-100 from 1936. Good playing set with p/p 6F6's and a very deco front panel. Tunes bc band to 30mc and has 6E5 tuning eye tube. No xtal filter on this one.
The NC100X does:
http://www.flickr.com/photos/42774321@N08/3941396777/ Looks like it is missing the back half of the cabinet but can be rack mounted with the proper brackets.
If I where close I'd jump on it.
Terry