I remember my dad telling me that his first camera was a Zeiss Ikon, which he traded in later for a Pentax Spotmatic. Looking at prices that Zeiss Ikons go for on eBay compared to Pentax Spotmatics, that was a mistake.

He also use to talk about how Nikon came from Zeiss Ikon during WWII in some type of Axis technology exchange, any truth to that story?