Very rare early version ( different from late version which don’t have f25) the first Leica 28 mm Len : Hektor 28 6.3 LTM . Sn 33xxxx dated 1936. Len in great condition. Color ok but B+W the best . note this Hektor built in 1930s and still no color at that time . Collection item . Len only w front and rear cap. Test W M9P

https://chan.nds.hk/blog/?p=13504

https://classic.leica-camera.com/en/Leica-Systems/Screw-Mount-System/Lenses/Wideangle-Lenses/Hektor-6-3-28mm/

https://i50mm.com/gear%E5%99%A8%E6%9D%90/leica-hektor-28mm-f-6-3-1935-1955/