I've been recording observed guns and looking for the transitions in the early Ansley H. Fox graded smallbores. In the 16-gauge guns the new "Gough" engraving begins appearing in the 30022x range, but the first gun with a Deeley lever forearm I've recorded is 300450, but the snap-on/off forearms exist at least into the 30049x range.
Harold, does your 300640 have Krupp or Chromox barrels?
In the 20-gauge guns the engraving changes somewhere between 200240 and 200323. The earliest 20-gauge I've handled, which has been displayed at our A.H. Fox Collectors Association, Inc. booth at The Vintage Cup a couple of times is 200002, a CE-Grade, and it has the Deeley forearm latch as does 200097.
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