OLD SCHOOL GT PRO SERIES

A MACH ONE WILL HAVE A M1 STAMPED ON THE DROPOUT NEAR THE SERIAL NUMBER IF IT IS AMERICAN MADE FRAME.USUALLY JUST BELOW THE SERIAL NUMBER.IF THE SERIAL NUMBER IS ON THE BOTTOM BRACKET IT IS MADE OVER SEAS AND GOOD LUCK FIGURING OUT THOSE NUMBERS.

THE WAY TO IDENTIFY IT AS A PRO SERIES IS THE VERY DISTINCTIVE, FLAT AND SLOTTED BRAKE BRIDGE.THESE WERE ONLY USED ON THE PRO SERIES FRAMES AND NOT THE MACH ONE OR INTERCEPTOR.