Ken, I checked my two byf 42's and both have the last two digits of the serial number on them plus the proof/acceptance code E/135. One is # 2922b the other is 2567b, someone here can tell you what month they were made to give you an idea of the period in which they were being numbered. One thing to watch out for on these is the stamping seems to be half-hearted on all four of them, in two cases with only a portion of the numbers being stamped and on one only the eagle of the acceptance stamp is visible in addition to partial numbers. On two of them the two numbers are separated by about an inch and only partially stamped at that. Also two of them have an added V on them, I have no idea what that indicates, hope this helps a little.
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Utah, where gun control means a steady trigger pull
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