As with any just about any collectible it value depends on numerous factors which include it condition, date, country of origin, denomination, errors, the market at the time, etc. Depending on its exact condition and mintmart I would say that your Peace Dollar is worth between $21 and $26 without a mintmark in relatively good condition and $50 to $200 depending on its exact condition if it had an S mintmark (look to the left of the eagle's tail feathers).
