Listed on eBay and posted here for posterity are two TP-6-A "Toasters" that were either made as or converted to intercoms. From the base, it looks like component mounting rivets were drill out. In either case, this is just an example of intercom "speaker" phones that are discussed occasionally on the forum.
http://www.ebay.com/itm/122333785120
I doubt these were ever tp6As CTE sets were metal but were the plastic civilian 1000 series sets.CTE might have sold the empty shells