These test pieces from the brothers were made the year before the final mold was made. Notice the tail on these figures all go backward while the final mold put into production has a tail that goes forward. May not be a big thing, but if you're into the very rarest and unique aR, you wont find them anywhere else, ultra rare opportunity.
The white ones tail is repaired, but given it was made by one of the brothers and the only one to exist kinda supersedes that.