Chris - Hope an Dornier expert be allowed examine it in detail before immersion in Lemon, you know whos doin that?
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That plate is a starter.
Best. Nr. 54xx6/4 ? (typical Henschel order number, not tiable to W.Nr., so far as I know)
Zeich.Nr. 17.57x-315 (wing part drawing number)
Typ. u Grp. Do 17 Z (as expected)
Kontr. (230) inspector nr.
<H> Henschel stamp
<BA> Bau Abnahme inspection stamp
(last is for Kontoll i.e. Quality Inspection?)
Plate appears not a significant one (also inicative by the -515 in wing part), so no date stamped.
-ed