This is a Kastor 11/16″ Straight Razor that was manufactured in the world’s cutlery capitol, Solingen, Germany as marked on the tang.
The blade features a slight smile for easier shaving and a visually aggressive square point. This razor is a model #1100 made by A. Kastor & Bros. The tang features bottom jimps for easier control. The scales are made from black horn and have been repaired. They should last for the life of the razor with proper maintenance.