This C4, with the Geiss mount modification, s/n 0293268, is about the smoothest example that I have cleaned and restored to date. And the speeds are as close to true as I have seen in a C4.
On a hot July day I took it to the Museum of Transportation for a "test drive," loaded with a roll of ASA 200 print film.
Film was sent to Dwayne's in Kansas for developing.


Please click on thumbnails to see enlarged.
All images are ©2018 E.J.Kowalski.
Thanks! Ed