Let's start with the Leitz M-Rokkor 90mm 4.0...
Made in Germany by Leitz for the Minolta/Leica CL in the seventies.
Exact copy of the Leitz Elmar 90mm. Leitz/Minolta cooperation was really intesting and appreciated at that time.
One can find good samples of these lenses but the 40mm is often covered by white dots on the front element !
The 90mm can be found in good conditions, some haze on the middle element sometime.