Contact chuck bishop and ask him if there is any order book info that a letter be provided from. The serialization book is based on just the surviving stock books.
If a letter is not available, the. A very keen eye will be all you will have to go on unless you can get some photos of the gun to post up here. A DHE 20 will no doubt carry a deicent price tag, so you should thoroughly assess the gun before you buy.
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B. Dudley
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