[Heathkit] Heathkit Knobs-AC-1 Antenna Coupler

[John & Jo-Ann Dicker]

GA and Season's Greetings to one and all.  I am a newcomer to the List so 
please accept my question in that light.

My question has to do with the style of knob found on the AC-1. I have seen 
pix of the AC-1 with black, pointer-type knobs and also with the style of 
small knob normally found on the DX-40.  Am I right in assuming that Heath 
used both styles of knob during the production run of the AC-1 period and, 
if so, which style came first?

I also wonder if anyone has ever seen a stock AC-1 with the DX-40 type knobs 
with the white indicator being of the arrowhead shape as opposed to a 
straight white line?

I appreciate that this is taking detail to the extreme, but any answer(s) 
that you can give would be very much appreciated.

73,

John  VE3CSJ  Ottawa