Is this a Realist Custom?

[P3D <GCCampos@xxxxxxx>]

Is this a Realist custom or not?


Serial Number:  019608
Lens cap (which is broken off) says "Realist Custom".
Rewind and Wind knobs are oversized.
Focus knob is indexed (it clicks), and has a depth of field scale. 
Has  countdown frame counter.
Has aperature ring handles, and aperature markings on top of shutter.
Has larger grain leather covering (kangaroo leather?)
Has the word "germany" (not "rare earth") on the top ofeach lens.
Shutter speeds only go up to 1/150.
Has white loading instrucions inside, above film path.
Has the numbers "ST41-10-1"  and in little letters, and the word 
      "Alcoa" in a box with an X by it, all inside camera take-up 
       spool area.
Has brighter chrome than the realist 3.5. 
Has a white painted "50" under the film pressure plate.

Could it be a prototype custom?
What else can I look for to determine which it is?

Any help would be greatly appreciated.


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