Hi Petra, it is a bit hard to tell exactly what it is but my best thought is that it is some type of fungus or mildew best described as a milky film, possibly caused by humidity. It has always been stored in its carry trunk but has been in coastal regions for the last 20 years.
From now on as well I think I will be keeping a couple of those little moisture absorbing bags in with the scope as well.
cheers
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