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Wayne you were able to view the white 21 again but from a different view. the 2 should remain the same for Baer's crate I feel. And as the 21 was a Sturm machine feel that pic was taken before December 44's end and the crate just left in the damaged condition that it was and replaced by A-9's almost entirely.
Remember earlier conversations about 2 staffels of II. gruppe desiganted as Schwere-heavy to hit the bombers ? ...... white 21 proves that in my mind so my hypothesis for the time being is that 5 staffel had A-8's and variants as well as four cannon equipped A-9's in the line up.
Wayne, what is your panel line technique. HB or B chisel pointed pencil?