Re: D-ISBY not in pre-war civil registrar?
If you look at Peter van Gogh's German registration list over on LEMB, you will not find a D-ISBY. There are only two found (so far) in the D-ISBx sequences, 'C was the Ar99V3 and 'O an Ar76A.
I don't believe that the D-Ixxx were applied in any sequence, but chosen at (apparently) random. However, there does appear to be a lot of Ar76As in this area of the list.
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