Thought I'd resurrect this thread instead of starting a new one...
Anyone with a later model Minox C notice that the CdS cell is engaged at 15? I was checking the camera before putting it away for the season and noticed 15 was too fast. Then I took it into the dark and it seemed like 15 again.
Unless this is a defect, I think 15 might be actually A with a low "limit" of 15.
The A setting will go to many seconds as it should.