Steve, I am unsure, don't have my books with me. DWM's were not made by DWM, but during the change over you will still see DWM toggles, but they started marking them with codes. By memory, the 1940 should have a 42 or s/42 for the toggle, not a DWM, so the DWM was an old toggle that happened to have the number or was put on there.
You have to have a book that talks about whichever era you are interested in. I like Jan Still's books, mainly because it makes it so easy to see by era.
Imperial for WW1 and earlier
Weimar for 1919-1934
Third Reich Lugers 1934-1945
You can then just pull out Third Reich Lugers (sometimes seen as TRL) and look up what a 1940 should be marked as.
There are a few folks that might say that the DWM was added during the war, but being a 1940, germany was still winning, so why wouldn't they pop on a S/42 or a 42 marked toggle....
Ed
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