Dave mine is in the 455xxx range and lacks the choke markings as well. I recall the 7E 20 at auction. At the time I believe most everyone believed it to be the only one thus the selling price of some 77K, going off memory but I think that's close. Suddenly some short time later another surfaced which brought about a third the price of the first one. That gun had some unusual markings on the flats that may have hurt the price. You probably recall or have pictures. I have never seen a 5E 20 configured as such, what a gun that would be.
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