I have one of the darker brown (amber) bottles, would have sworn it was spot-on, till I came to this forum. Ah, ignorance is bliss.
But seriously, when the bottle is filled, it is harder to tell the true color of the glass. Just as lighting conditions will change how the painted leather appears. Dare I say it, whatever is “dead-on balls accurate”, I like my amber Dickel bottle with Macau Orange paint very much!