CTC-5, the metal trim holding the safety glass in is a dead giveaway. Not sure which model though, possibly the Aldrich on a stand?
http://www.novia.net/~ereitan/Galler...c5_Aldrich.gif
Yet another set with a mask having the word 'COLOR' imprinted on it, only the second one I've seen. Did we determine this was a feature of later production CTC-5's? My Wingate does not have a mask with 'COLOR' on it, where later sets using glass tubes did.