Most Auto-ALPAs were made by Chinon for the Si2000 ALPA. At one
time in early '80s, a good number of Auto ALPAs were sold in a
discount camera store in Tokyo at a close-out price.
It might have been that Pignon S.A. ordered Chinon a batch of
lenses and cancelled.
We know of the existence of 28,35,55,135 Chinon Auto Alpas so