Is there any regular maintenance that should be done to protect the leather bellows on old German folders? I use a 1948 Zeiss as an every-day shooter. It's in great shape, but that leather is 65 years old and must need something to stay that way.
I use Woly Sport Wax Active http://tinyurl.com/7kttlp7 on the bellows leather of my Zeisses and Voigtländers, once every few years, depending on climate etc.