[INM@RLM]

Re. your #11. Yes, Volker is definitely the safer bet, Stig. (I hadn't looked at this piece in years.) However - going a little off-piste - I have a bunch of He 111 H identities immediately before this Volker block. Those start at 8356, and there are enough to reconstruct the full Stkz. sequences up to around 8437 with some credibility. These place the sub-type change from H-11 to H-16 that Volker has put at 8456, rather earlier at around 8412. (More data will resolve that, I'm sure.)

I'm curious though as to the source where you found the 8456-8555 block of H-16s. In his ADL digital article (heinkel-he-111-serienbau-bis-1945-luftwaffe-bomber), all that Volker has to say on the H-16 is: "Ab Dezember 1942 begann die Auslieferung der He 111 H-16, die im Dezember des Folgejahres endete. Die Zahl der gelieferten Maschinen lag in der Größenordnung von etwa 1100 bis 1200 Stück. Die Werknummern gehörten in die Blöcke 8156-8355 und weitere sechsstellige Nummern mit den Anfangsziffern 160, 161 und 162."
That is, he appears to directly contradict what he wrote on the H-11 in the paragraph just before. ("Deren Werknummern lagen in den Blöcken 7955-8155, 8356-8455.")
Curious, but none of us are quite perfect yet. However, when and where did he correct this please?