You need to check to see if it is a .30 Luger caliber pistol (rather than the larger 9mm Luger caliber).
If a No. 2 pencil just fits into the barrel, it's a .30 Luger caliber pistol.
If it fits real loose, it is likely a 9mm.
Your serial number is "9701O" which puts this DWM alphabet commercial manufacture date around 1924.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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