.455 Webley caliber, 6" barrel, S/N 215745. The right side of the frame is marked with numerous Birmingham proof marks, the model MARK VI, the Webley patent roll mark, and date of production 1916. Overall, this revolver is in good used condition, retaining the majority of its original matte blue finish. The black plastic "M" marked grips are in great shape and retain their checkering.