Pete, Costanzo on page 356 shows several examples of the lug markings, many with eagles over a number, some with up to three nembers(1900 DWM) and attributes them to being proof marks. If you have a specific example I can try to find the info. Nothing shown for the number in your picture. Both Vickers and Simpson liked to stamp nearly everything, so finding the last two on the lug would not surprise me.
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Utah, where gun control means a steady trigger pull
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