Theodore R. McElroy
Boston & Chicago

World's Champion Radio Telegrapher
77 WPM in 1935, Ted typed at 15Ø WPM
194Ø ARRL Handbook ad - page 524 CP-810 CP-810 CP-810 CP-810
Telegraph Apparatus Company
Hole in the Wall Bug 

Model          CP-81Ø
Production Run 1936 - 1938
Base size      4" X 7"
     finish    Chrome
Aquired        March 2ØØ1
Speaker Case Speaker Case Speaker Case Speaker Case
Telegraph Apparatus Company
Speaker & Audio Amp 

Production Run 1936 - 1938
Base size      4" X 7"
     finish    Bakelite
Aquired        March 2ØØ3
1938 1938 1938 1938 1938 

Model          Deluxe Model Mac Key
Production Run 1938
Serial Number  347
Base size      4" X 6.25"
     finish    Deluxe Marbelite
Damper         Bent I
Aquired        Febuary 2��2
Sold           September 2��2
  to           KG4CYO
The dash contact support is broken and missing. The early (thick) stabilizer or dot-spring pre-tensioning device, used to prevent "split dots" (Vibroplex), or "Pffft" (McElroy), is missing. The pendulem return spring. A better view of the Marbelite.
Model 100 Model 100 Model 100 Model 100
Stream Key 

Model          1ØØ Amateur
Production Run 1942
Base size      2.5" X 4.5"
     made of   Black Plastic
               Also in Gray or Red
Aquired        March 2ØØ1
an e-mail from The Morse Reflector warns...
I had a black one in my display case for years and one day I forgot to put up my tent and the sun heated the case and the key melted... OOOOPS !!!
Model 100 Model 100
Stream Key 

Model          1�� Amateur
Production Run 1942
Base size      2.5" X 4.5"
     made of   Cast Iron
Aquired        March 2��1
Model 300 Model 300
Stream Key 

Model          300 Deluxe
Production Run 1942
Base size      2.5" X 4.5"
     finish    Chrome
Aquired        June 2��1