Based on the photos and input so far, I have the following.
Brand Value level four (BV4 - Lessor known Continental makers and/or associated with lower quality). Original Quality grade six (2nd quality BLE); assuming it is an ejector gun. Current Condition level between level three (CC3 - Significant use) and level four (CC4 - Heavy use, but no abuse).

BV4-OQ6-CC3 = $1,160

BV4-OQ6-CC4 = $883

Do note that generalizations about a gunmaker's quality are subject to considerable error as most makers made a wide range of OQ grade. Therefore, we must asses the quality of individual guns. Likewise for Current Condition. The maker's reputation is factored into BV level.

Please also note that this is a "value", and not at all a suggested price. You might choose to pay more to a dealer with a sterling reputation and less in a deal with unknown parties. It is intended to jump start you in understanding how the "market" see various guns.

DDA