The Casiotron model is 03-506. I also think Tissot used this case and module.
The Tissot model is here
http://www.digitalwatchlibrary.com/DWL/ ... casiotron/
and here
http://www.digitalwatchlibrary.com/DWL/ ... t_-_Casio/
They date from around 1976-1977
Also used on the S-11
http://www.digitalwatchlibrary.com/DWL/ ... asio_s-11/
I will try and get a photo of the 03-503 as it looks identical to your Hamilton including the liquid crystal wording.
Casio, QW03-51S, $178.00, 1/1/1976, QW03, 386, Alias 03-503(ON BACK).
regards
Adam


