Kerrigan Bennett wrote: "One thing that I find particularly interesting about this bike is that below the bottom bracket stamp reading "M59.5," there are two other smaller characters stamped that look like "G P" to me. "G P" could be for Gosta Pettersson. If this was actually his bike, this would be worth even more, I would think." ______
I took this to be "GF" for "George Fischer," the makers of the sand cast BB shell used by Masi in that period.
Ed Granger
Lancaster, Pennsylvania, USA