I do love Bare Knuckle P , put once on my beloved and too soon gone Bacchus Vintage Series BPB62 and it just kills. If I remember correctly it was the '58 , not sure to be honest. They made 2 version and mine was the more punchy version. Remember I've made some 60's Fender PB owners goin nuts when we compared my 330€ used bought Bacchus with their pre or post CBS P's.
That Bass was a special one...BK pups helped to sound really amazing