The 4K mean that this is the highest quality grain for a "Castello" grade. In fact, it looks to me that if the cross grain were situated slightly differently on the bowl, the pipe might qualify as an Occhio di Pernice. Regardless, the bowl exhibits the same amount of cross grain and Bird's Eye that adorn an Occhio. It's a Grp. 6 size. The acrylic stem is in excellent condition and there is just a wisp of wear on the inner rim of the chamber. FYI, it hails from the Carlo Scotti era.
6" long, bowl 2.2" tall. Weight: 1 7/8 oz., 53 grams.