Vern,
I have a couple of Test pieces with 7s in the serial number. The font on the fame and barrel is the same on both of them. However, since the 7 is stamped on the curve of the barrel flange, the lower end of the number is stamped deeper than the top and therefore flares out. This gives the vertical stroke of the 7 a slightly wedge-shape wider at the bottom. In the examples you posted, the “foot” of the 7s appear only visible on the left side. I suspect that is probably the same wedge-shape and not really a foot.
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If it's made after 1918...it's a reproduction
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