Why 04-12-1950? 12-04-1950 (!) is a technical date concerning the master, recording took place in 1949.
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Thank you, Raoul! Apparently 04-12-1950 came from inappropriate applying of GB/USA date format where month comes first. I entered 1949 as "Recording Date" and 12-04-1950 as "Manufacturing date" that for "Deutsche Grammophon Gesellschaft" records might have a meaning of "date of transfer from tape to disc master"