The type 1 optics ran from 59-63 the type2 from 63 on until asp. note this is from memory.
There were several different mechanical designs e.g. a LTM version but all post 63 were the type 2 optics.
They have a nice signature and the early ones are single coated...
The MTF diagrams are available for the type2 and they are good for the design epoc. It was popular cause it was small and light for 1.4 and good contra jour.
gbag space the final frontier...