[INM@RLM]

There is one other point in John's post #52 perhaps worth a double-check.
His comment was: "Perhaps you have looked at a different document than Petrick/Mankau, since their book shows that the block 3311-3418 only commenced production/completion from July 1940."

Well, it is definitely true that July is the start date of the 3311-3418 block given on p.324 in the tables at the end of Mankau & Petrick. However, what has then been missed is what appears elsewhere in M&P that fixes the start date for deliveries from this block far more precisely. First, on p.182, in the section specifically dealing with the Bf 110 D-0/B sub-type, M&P have: "In June 1940 the General Staff ordered that a portion of the new Bf 110s rolling off the assembly lines were to be equipped with the ETC 500. As an emergency measure Messerschmitt consequently fitted 13 Bf 110 D-0s (W.Nr. 3321-3324, 3336-3344) with ETC 500s, removing the belly tanks in the process. These machines were designated as Bf 110 D-0/Bs."
The June delivery dates for all 13 of these D-0/Bs are then confirmed on p.23: "6/40 The Messerschmitt company delivers the first 13 production D-0/B aircraft with ETC 500 racks."
So it was these references that formed the basis of my review comment in regard to WNr. 3322/3321.
[All page references in this post are from the Schiffer edition in English. In photos it is very easy to distinguish one of these D-0/Bs from the succeeding D-3 & D-3/N fighter-bomber versions because the rivet line under the forward fuselage where the Dackelbauch had been attached is very clearly apparent.]

An earlier than July start date for block 3311-3418 deliveries is also corroborated by the RLM's Delivery Plan LP 18/1 from the Bundesarchiv. In that document Messerschmitt reported a total of 103 Bf 110 Ds delivered by end-June 1940. The Ds had been introduced at Mtt only after C-2 series production had completed at Augsburg, and the first Bf 110 D delivery was WNr. 3134 in March 1940 (M&P p.181). This machine fell within the Messerschmitt Bf 110 block that began with WNr. 3000 and ended with WNr. 3202. Arithmetically then this first 3xxx block only included 69 Ds (i.e. 3202 minus 3133). Accordingly the balance of 34 D deliveries by the end June 1940 had to have come from the next Messerschmitt block beginning with WNr. 3311. As indicated by M&P, these 34 spanned WNr. 3311 to 3344, the end coinciding exactly with the delivery of the last of these D-0/B assembly line conversions. (Although aircraft were built in WNr. order when a single assembly line was in use, it was not always the case that they were also delivered in WNr. order. However, M&P are telling us that this was actually the situation in regard to the span WNr. 3311 to 3344.)

The almost complete lack of surviving manufacturers' delivery documentation requires that the delivery span dates given for most blocks in the tables on pages 324/7 of Mankau & Petrick are no more than educated guesses based on the dated WNr. identities found in loss records and log books. (M&P are perfectly open about their approach here - see p.323.) In some periods many identities linked with Werk-Nummern can be found, but in others these can be distinctly thin on the ground. It is not entirely surprising then that some inconsistencies have arisen between sections of M&P's text and their tables.

Taken all in all then, very sad but still a book very much worth buying. Had this new edition of 'Zerstörer' followed the conventional approach of first correcting the errors of the first edition, this work would have achieved very much more. The exchanges here may provide some insight into why that didn't happen. May the future hold better.