Here is a video on the Pentel PS315 - This is based on Jimmy’s @nimrodd research, and he generously loaned me the pencils for this video (Thank You again, Jimmy).
This covers all 6 versions of the PS315 and spans 4 generations of manufacturing changes to the P200.
BTW - here is a screenshot from the video that shows how the PS315 timeline spanned several generations of the P200. I am working on a similar video, but it will feature the P200 generation changes. Thanks again to @nimrodd for all the time he put into researching and documenting the P200
edit: for you “completists” - there are 6 versions of the PS315
