Is it a Gran Criterium? A Nuovo Strada? A 3V Volumetrica? A Prestige? Knowing the model will be an important first step. Check the Bottom Bracket to see if it has an "M" cut-out. See what the serial number is on the bottom bracket and write it down. Then post the serial number back here at this forum. There are many experts on Masi's out there in cyber land I have discovered. I agree that California Masi's are sweet! The detailing and perfection of the lugs, paint, decals and everything is right up there with other high dollar American custom frames from the era. I spoke personally with Brian Baylis one of Masi's former builders and he explained that the earlier Italian made Masi's fetch more money because they have a higher "Mojo" factor. When I puchased my Gran Criterium frame brand new back in '78 I bypassed the older Masi that hung next to it because the build quality was sloppier and it lacked the braze-ons that I wanted. Now I come to find out that the old one with the flat fork crown, no braze-ons, the lesser paint is worth a small fortune because of "Mojo" ?! Anyway I can say that I have one of the few Masi California Gran Criteriums that had the "Gran Criterium flags removed from the downtube and it merely says "Masi". Brian Baylis told me that these were made by Ted Kirkbride and that he purposely modified the decals like that on the black frames because the black in the decals didn't look good against the gloss black paint. Take a closer look at the bike, report back on the serial # and maybe post some pictures.