[Boatanchors] RME 4350

[Artmouton]

I own 2 RME 4350 and have a few questions if anyone out there is familiar 
with this receiver.

1) did the 4350A have that designated on the front panel.  I think one of 
mine is the A model but has no separate nomenclature.  It does have the "A" 
as the last digit in the serial number

2) what is the proper knob for this receiver.  One has a silver, two part 
knob the other just has the standard black with pointer area.  Both work 
well with the vernier system.  I always thought it was the two part silver 
but the one with the black works just as well

3) any reason why one would have no serial number and have a little plate 
tacked on to the front that says "dual conversion receiver"  Sort of weird 
to have no SN on it.

73 & TIA
Art K5FNQ

Art Mouton

"[S]o long as the people do not care to exercise their freedom,
those who wish to tyrannize will do so; for tyrants are active
and ardent, and will devote themselves in the name of any number
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men." --Voltaire