thanks for the infoFrom my previous communications with Schon about this same buttcap question:
BW1 (the original BWs) came in black or white buttcap. These were ebony handle(grip area), buttsleeve and points. If you look close at the grip area, you can see the wood grain.
BW2 the grip area was black linen with a hard coating and you might need to look closely to see that there is linen under the finish.
BW3 and newer had obvious ring design changes.
GLWS