Dear Martin,

Thank you for contacting Mearto with your appraisal inquiry. My sincere apologies for the delay with the apprisal.

The presented object appears to be a Colt US Army Model 1909 with an blue finish, 45. CAL and probably custom made horn grips. The serial number is #39691 which dates this revolver into the year 1911.
This piece is in medium condition and there is no serious damage visible in the images provided.
A fair market estimation would be between 350 to 700 USD.
This estimate is based on actual recent past recorded auction sales of comparable items. Retail "asking prices" can be higher and may vary.

With kind regards,
Georg