Mine looks about like yours does, Steve. My theory is that these were early production and they were not trying to polish the finished coin-inlays at all... not spun, and not buffed. The lateral scratch lines are what you might see on a planchet punched from a rolled sheet of stainless steel. The 4Q and DI 5's have this same appearance.

Just speculation, though. I don't think they have been modified by someone after production.

I show the other black-letter chips I've been able to find. The Desert Inn is probably the scarcest. The Coliseum may not be black lettered; just dirty. It's a brass coin as well.