RCA TK-40A Color Television Camera
This picture comes from the handbook for the TK-40A.
The external differences between the cameras are:-
The TK-40 prototype has square sides and is dark in color.
The TK-40 has no ventilation louvers.
The TK-40A has louvers on the viewfinder cover and the front top, but not on the sides.
The TK-41 has additional louvers on the front top cover sides.
The TK-40A color camera was featured in the RCA Broadcast News #77 Jan-Feb 1954
See the 10 page article available at American radio history