I am pretty sure it depends on when it was made. After a certain date, the slide was marked with the serial number, before no. And the inside marking is very easy to be rubbed out and/or hard to see, sometimes you have to shine a light just right and the right angle.
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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