I have an Olympus Zuiko C. 1:3,5 f=4cm lense fitted for my Exa and Exakta VX Ihagee Dresden. The number on it is 62431. I'm getting out of the collection of cameras I have acquired over the years and am discovering a few treasures I've been sitting on. I never really cared to looking 🆙 the value on anything because I wasn't planning on selling. ..until now I guess. Can someone out there tell me if what I got is something or if its common. The value would help as well. Thank you.