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[CheshireNoir]

... the part cased one is an early 16k unit with one Basic A rom missing.  What freq is on the crystal just above the 9 key ?  If its 12.0, as I suspect, it an early 2mhz bee rather than all the others that followed that were 3.375mhz

The crystal seems to be 12 MHz, so yes. 2MHz Model. (At least, all I can see poking out is the 2.00 with the rest cut off by the Keyboard)

Cool! Thanks for that! Interesting to know.

Chesh