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Re: Ju 290A-4, W.Nr. 165
According to the appendices, Kössler/Ott are using original Junkers, RLM and other original sources in their 260p opus in collaboration with the Hugo-Junkers-society. IMO this book is absolutely reliable, though some details may be outdated because of its publication year 1993. The 9-digit WNr seems to have been used only in official documents (this WNr ought to be expanded by an additional 8-290110xxx, to be honest).
The abbreviated 4-digit WNr seems to have been quite common. Even Junkers Dessau used painted WNr during construction such as 290-0159 or 290/0160. A complete 6-digit WNr is not necessary because only 47 Ju 290 have been built only at one pruduction site. Me 262 jets oftenly were designated by a 3 -digit abbreviated WNr which makes it difficult to distinguish the 170 block from the 110 block e.g.
Regards
Roland
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