Your #4070XX, per my database, was most likely shipped near the end of 1925 and therefore would have a penciled stock #.
• Stamped since 1857, stock serial #s, always right side only, changed to penciled #s c. 1900 and back to stamped #s in 1929. Scratched, penciled or stamped on hard rubber grips and sometimes premium grips (1893 - ivory or pearl were offered but not stamped); stock numbering finally discontinued ~ late 1970s.
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Jim
S&WCA #819
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