Twice in the last week or so, I have been contacted by members saying that there is a Clay Grade offered for sale. I checked the two serial numbers, and they were listed in the Hunter Arms Company records as Trap Grades. Both had typical Trap Grade engraving. Apparently, an imperfect roll-mark on the right barrel can give the impression of "Clay" rather than "Trap". To my knowledge, there is no such thing as a "Clay" Grade. If you use your imagination, you may be able to read this roll-mark as saying "Clay".
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