Pete,
It is commonly thought that 1940 is the date that the switch from Crown U to Eagle N took place. In Jan Still's book "Third Reich Lugers" he has a chart which breaks this down on page 138 and 139 and shows no Eagle N's in the "V" block.
Not being a Swiss collector I do not know the different Swiss variations, or what is correct on these, but a gun with a serial number of 3721v is a fairly early gun in the "v" block which I would assume should have Crown U markings. Guess you'll have to do more research on this, but it doesn't sound correct to me, but then again, I'm not a Swiss collector. -- Bill
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