S. A. / E.McF. (Springfield Armory / Earl McFarland).
Earlier Variations
Approx S/N 700,000 - 1,200,000 (Declining usage likely 1-1.2m)
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Circled 'P' proof mark with serifs on the pistol grip
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Ordnance Wheel with Crossed Cannons.
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Small Ordnance Wheel & Large Ordnance* Wheel (Very Rare)
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Scooped/Tapered Clip Latch
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Observed with both large and small Ordnance Wheels.
*A note about Large Wheel variations. EMcF, GAW, and NFR, all have examples of the Large Wheel. Unlike the GHS these do not fall into any specific timeline. There is some speculation that these are personal stamps. Potentially used only when additional help was needed for final inspection.
Later Variations
Approx S/N 900,00 1,800,000
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Circled 'P' proof mark with serifs on the pistol grip
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Ordnance Wheel with Crossed Cannons.
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Small Ordnance Wheel & Large Ordnance Wheel* (Very Rare)
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Flat/Straight Cut Clip Latch Cut Out
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Small .188" Ordnance Wheel stamped on the bottom of the pistol grip. Note: This later version has been noted with and without pistol grip cannon.
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Observed with both large and small Ordnance Wheels.