1600 was introduced in 1964.
1600-2 in 1966 with 1602 as the continuation.
See:
http://www.bmwworld.com/models/newclass/index.htm
I think the papers to go for are 5117 Ã*f 1966 for the 1600-2 (page 2 of the list).
It has 61 extensions of homologations and probably covers also the 1602.
It should have all the homologations you may wish.