Many thanks to SWLing Post contributor, Ron, who writes:
Thought I had seen them all, but here is the military version of the S-38:
Also an earlier version of the Echophone:
I’m a huge fan of Hallicrafters radios–especially from this era. I’ve a friend that has this version of the S-39, but it hasn’t been restored yet. When he does restore it, I’ll try to steal it for a few weeks and head to the field pretending I’m listening to instructions from HQ from behind enemy lines!
Thanks for the tip, Ron!
Update: Ron also points out this excellent gallery of Hallicrafter radios.