Teletype Model 28ASR Prototype 

Undated brochure:
"TELETYPE 100 WPM TAPE SENDING SET WITH SEND-RECEIVE PAGE PRINTER"

28ASR artist's conception - including TD and auxiliary typing reperf
28asr-proto-2011-01.jpg (3523061 bytes)
Prototype - 28KSR with M28 perforator and M14 TD
28asr-proto-2011-02.jpg (3662613 bytes)
28asr-proto-2011-03.jpg (2499762 bytes)

Also see the similar undated brochure -  Model 28 Family Prototype Info, Photos, and Artist's Conceptions