{Collins} KWM2/2A manuals

How much change happened in KWM2/2A manuals from 1962-1978?  I have just acquired a very early KWM2A from 1963 without manual and noticed that the one in the archives is from 1978.  We're there many changes over the 15-16 years?

Thanks for your input,
Thaire. W2APF

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