Designed and adopted in 1917 to supplement the 1911, the M1917 was a military issued revolver chambered in .45 ACP. They were dependable revolvers and were produced for several other nations as well.
This revolver was manufactured in 1918 and is in good shape for its age. It is missing the half moon clips required. That said, half moon clips can be found quite easily on surplus gun part websites.
Serial number: 20456