Wurlitzer

Thanks James, I certainly give that a try too but also found that using Mothers Protectant on the vulcanite has helped a lot and the crack has settled back, besides making it look very good too. The M3 is certainly an early one, 61st made!

James Elwing, thanks for your post, I came to here hoping to find an answer regarding keeping vulcanite covered cameras in dry-safes, you answered it perfectly. I recently bought a Leica M3 (serial number 700061) and it's been in my dry cabinet for around 6 weeks when I noticed the otherwise perfect vulcanite covering had developed a crack on the rear door section, I run my dry cabinet at 30 - 35%! I've now adjusted it to 40 - 45% and will need some vulcanite care to try and restore any drying that may have occurred. I live in SIngapore so dry-cabinets are essential 70% plus humidity here all year round, it's very common to find people discarding lens (and cameras) due to fungus! Thanks for your very useful comments.