Color code question

Zuggy

Adopt don't shop
Jul 7, 2013
665
22
Beautiful Berks County, PA
Hi, first please accept my apologies. I suspect I have placed this post in the wrong category but really wasn't sure where to put it. If it should be moved, please Mod's, feel free and thanks!

So my question....There's a bag that I'm interested in. Circa 2006. The tag says B4/MX. I know the B4 refers to the brass hardware, but what is the MX color?

Thanks in advance, I know with all these brilliant minds here, someone knows what it is! :idea:
 
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