Fungus in Leica M viewfinder?
Hi folks, I recently bought a Leica M in 60s' from a renowned shop on eBay. The camera is mostly in mint condition as described but there is some very tiny, tiny traces of dendrites-like structure on the upper right corner of the VF. I managed to take two shots from front and back of the VF and attached them here. Could anyone share some view on whether these are fungus? and if they are not, what are they?
BTW the seller is very friendly and willing to accept return (or a 10% refund at around $100), but I'd like to know the nature of these things to decide. any comments and advices are appreciated. thank you!