Re: Hudson Serials question.
Air Britain's EA100-EZ999 agrees - gaps were deliberately left to confuse German intelligence - these were known as "black-out blocks."
This book is about to be revised, so may change, but I suspect Bill has the right answer. That's an awful lot of aircraft just to disappear from history.
Another source should be Air Britain's Lockheed Twins, but having seen Bill's comment I haven't bothered to check.
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