Here's something Bill Davis who designed the original Faball Blue Hammer and Faball Burgundy Hammer shared with me in a Facebook exchange: The RG and differential on those two pieces were 2.52/.020 and 2.51/.020, respectively. This was for 16 pounds, of course, because that was the weight of choice back then. Nonetheless, those original Faball pieces were way ahead of their time, which in part made them some of the best pieces ever made.