Recently I bought some Leica A36 filters.
One of them is an unused FSEOO with a black screw.
The seller told me that he has bought the filter from a Swedish men who had bought many Leica parts from the Swedish army.
I have never seen an A36 filter with a black screw, so I think that this filter was intended to use with the Leica IIIF Black Edition from the Swedish army.
Can you tell me if I am right or not, is it a very special filter?
Kobus van Leer"
Hoping that Gunnar or Lars can makes some report about