The following appear in my January 1, 1928 parts list:
The following have no suffix, suggesting they are the same parts since inception.
A1000 PH Generator: hard to tell from this orientation, but I believe the post is on the 'side' of the case.
A10078 PH Generator Case: appears to have the post for the cutout on the ‘side’
A10130 Pulley: hard to tell from scan but I don’t think this has the 2 stamped holes of the very early design. However, there is no suffix suggesting a change. Could the 2 hole be from a different supplier?
The following have a “B” suffix suggesting a change before the date of the price list.
A10150B Bracket: the familiar ‘oval’ bracket, unlike the one shown in Bick's earlier photo.
A10152B Adjusting Arm: I have seen discussions about a ‘short’ arm, but this appears to be a ‘long’ arm. What is the “thickness” of this arm?