Hi Walt,
Welcome to the forum.
Dwight Grubers Commercial Database shows that S#42485 would fall in with '1908 Commercials'.
The characteristics of early 1908 Commercials are:
"BUG" proofed... C/B, C/U ,C/G on barrel, C/B, C/U on left side of receiver
DWM on toggle
9mm 4" barrel
No stock lug
No grip safety
Blank chamber
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Mike C.
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