{Collins} KWM-2 History Questions

I've got a fairly early KWM-2 that has a chassis plug
where a 14Mhz Driver Plate trimmer would have been. 
It's even stamped "(C) 14", and has the 2 small
trimmer mounting holes.  Did they ever produce KWM-2s
with that trimmer, or was it deleted from the design
after the chassis were stamped?

Also, one of the rear RCA jacks on this unit is marked
EXT MUTE where the SPARE is on my -2A.  I don't have a
schematic for this, and the wire is eluding my old
eyes under a turret.  Anyone know what this EXT MUTE


Bob - AE6RV
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