I am hoping someone can help me figure out the threading on a new fork I just bought. Gorgeous Italian steel job, but no info on it. I was assuming it was either Italian or ISO, but there is a flat channel filed into the threading on the back of the steerer. No groove, but a flat section obscuring the threads. I heard this might indicate that it's French. Anyways, I'm about to buy a headset for the project, but now don't know what I need. Does this filed section mean it is definitely French? Is there an easy way to figure it out? Thanks for any help!