For some decades, Savinelli used unfinished pipes as seconds, and they usually had a fill or two, but mostly inconspicuous, and they darkened and attained luster in a fine way. You can still find these, but the Rossi line, purchased by Savinelli has absorbed some of these and sold them with dark stain, and the prices on the Sav unfinished pipes has gone up in price, along with everything else. Other brands have featured upscale versions where the pipes have mostly no visible blemishes, and others have textured carving but no stain, and no visible blemishes. But the principle is the same, with the pipes taking on color, shine, and patina over several years. The the luster continues to deepen with time.