[BigJJ]

You do not need lathe remnants or a circular hole in order for a bat to be considered professional model. This is not a make it or break it. Evidence of hand turning may also be found in the lack of bottom of the knob markings (lack of - inch marks, company logo, trademark, etc.), in the brandings themselves, and elsewhere. I view lathe remnants as a positive though, as they are additional evidence of hand turning. so a lack of lathe marks does not hurt, but their presence can help, from my perspective. Lathe remnants are really a pre-1930 happening, there are examples thereafter, but a greater proportion of professional model bats had this attribute pre-1930, than post-1930. By the time of model numbers on the bottom of the knobs in the 1940s, a clean straight bottom was demanded. so really when I think of lathe remnants, it is mostly pre-1930.