Just for grins, I asked the google AI about the difference between the Mark I and Mark II versions of the Model 28. The response looked pretty good, mostly relying on the (ahem) outstanding resource here

https://www.navy-radio.com/tty/28-mark.htm

But the AI response also relied on this-

As a Mark II, this model benefits from updates over the Mark I, including improved interior ergonomics and subtle styling enhancements…

(From a web page on the Jensen Interceptor sports car. )

YMMV,

Nick England K4NYW
www.navy-radio.com

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