There are many factors that affect value. We would need a lot more information about the gun, and pictures. Description should include the gauge, barrel length, frame size, length of pull, drop at comb and heel, bore condition, and detailed description of condition of all metal and wood surfaces and preferably good pictures of all these things. With the information you gave in this question the value could be between $500 and $5000, but more likely on the lower end.
The less information that you provide, the less accurate an appraisal will be.
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