kind of... there are unofficial "batches" of the psycho. serial #'s with 8xxx and 9xxx are considered "first batches". with that being said, i have had and have another "first batch" and have come to find that serial #'s later than 8 and 9xxx get hotter faster, but don't last as long where as the 8 and 9xxx serials take a good 800-1500 swings to get good and broke in, but last WAY longer.