Rare Bridgestone XO-1, Construction Pumpkin Fork. I  believe the cantilever to be original and possibly the headset with the exception of the black top nut but I am including everything as found. Steerer length is 6.5" from top of fork crown to top of threads with just under 1.5" of threads. There are some paint chips and scratches typical of a pre owned bicycle fork. In the interest of full disclosure, I have learned that these forks were recalled at some point. The  steerer tube on this one is stamped with the Bridgestone "B" and C40 just below that.