Good condition second early version (according to SN number 14528 screw mount version ) Foca 50 1.9 coz the previous one focus not accurate in infinite. This Len belongs to third modification of screw mount: 1.9-2.8-4-5.6-8-11-16-22
Also the adaptor ( screw mount modified to Leica M ) better and more reliable. Plus add the step up ring for 40.5 mm filter . Hairlines only and nice coating ( royal blue and amber which met early second version )
Len only w back cover and front filter.

https://chan.nds.hk/blog/?p=11119

https://www.360doc.cn/article/48848119_1072598362.html