Frogger control panel - carriage bolt finish?

joeycuda

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On the Frogger control panel, there are 4 carriage bolts for the joystick and 3 across the top edge that secure the panel to the cabinet.

Does anyone know for certain what the finish on the factory original bolts were? Black phosphate, actual painted black, zinc plated, or what?

Thanks in advance! Google Image search hasn't solved the mystery for me.
 
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