[GreenKeys] M28 identification - Mark I vs Mark II vs Mark III

[Nick England]

More idle curiosity - and to create a web page with some info and photos
I think I know the following quick ID features:
Mark III
  - new style cam transfer levers for keyboard transmitter.
  - new style keyboard hood and key guide with 2 screws for clear info
covers
  - printer has new style left side mounting for stunt box
  - printer ribbon spool hold-downs are wire
Mark II
  - old style cam transfer levers for keyboard transmitter.
  - old style keyboard hood and key guide with one screw for clear info
covers
  - printer has old style left side mounting for stunt box
  - printer ribbon spool hold-downs are solid
Mark I ???
 - is this like a Mark II but with the very early 2-row electrical
connectors?

Did the printer and keyboard have separate Mark generations?
i.e. Was there a Mark III keyboard before a Mark III printer or did they
change at the same time?

I'm sure there are some glaring differences that I have completely
overlooked - additions and corrections are welcome!

Nick England K4NYW
www.navy-radio.com
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