Bark bezels

[neeb]

Hi all, first post here.. :-)

I find myself drawn to the "bark" bezel day dates. However, despite this being a relatively uncommon option, pictures online suggest that there were several different types of bark bezel. Either that, or some are fake...

Some lool very "barky", with no obvious regularly repeating pattern. Others almost look like engine turned bezels with regulaly repeating ridges, but with finer "bark" patterning in-between. Others are sort of intermediate.

Are these all geunine? Did the bark bezel go through several iterations?