[UpAllNight]

well this maybe one subjet that i may know something about...i have been in the tool and die trade for 25 years and cnc milling for at least 15..started out using a 10mhz machine..lol...any way i think this block could be cast to at first look...but by the finish on the bottom i would doubt it...u could never get such a finish out of a cast part..what i think u are seeing is the bad mill that they had trying to get such a small endmill down so deep....then i believe they sandblasted the top and the groves...that my thoughts on the whole thing...for what its worth...hum gives me some good ideals though....could really do some funky stuff with a wire edm machine...hummm