I just got this Castello Sea Rock pipe yesterday, an estate, and it is the finest pipe I've ever smoked (as well as the most expensive at $200). Could someone help elaborate on the nomenclature? It reads thus: "Castello Sea Rock Briar/ NS 75/ Made in Canto Italy/Carlo Scotti". Calling on Castello users: this is my first, and given the price, the only Castello I own, but what a great pipe!