There are not that many areas of human endeavor in which crust is regarded as a good thing, but numismatics is in fact one them.
As in the original, "crusty" aged patina seen on the cool, XF45 and CAC-ified Capped Bust Quarter featured in this week's ad and celebrated by our mellifluous rhyming caption.
Captions that didn't make the cut:
The only other alternative this week was "PQCBQ.", ultimately rejected by us as having too many consonants in a row.