The original brass plating on most wireform ramps is very thin, so if someone polishing trying to remove oxidation or corrosion gets carried away it will easily come off. Not saying that's the case here but just a thought
I think the gold production run came in 1995, 2-3 years after the original run and hense the system and hardware differences everyone is referencing
The "half and half" games were built in between the 2 runs. I'm not sure if early or later, but those hybrid games are actually the most rare of TAF machines. I've owned all 3 types and those look the best in my opinion, with the gold cabinet and standard colorful playfield plastic pieces.