Looking into selling this for my mother.

The serial number is 60177.
The barrel length is 28 3/4".
Barrel markings are: Selbstspanner System J.P. Sauer & Sohn, Suhl and Fluss.Stahl Von Fried.Krupp.Essen.
Left sideplate says J.P. Moritz - Sohn.
Right sideplate says Leipzig.
Near the indicators (correct term?) is says DRGM 17913.

Not sure of what all of the markings mean, but was interested in whether anyone knows what model this is? Year manufactured? Value?

Thanks for any info.
Bill