Vintage WM. A. Shull Straight Razor

Probably William Shull, who was in business in Philadelphia. If you google his name you find razors, hair tonics, strops, etc bearing his name. He had several lines of strops including the Horse Tail and the Perfection - the Perfection has "Patent Aug 1891" stamped on it.

There is also a William A Shull recorded in one of the US Census records as a 'shipper' in Philadelphia, so he probably operated some sort of barber supplies company, importing razors.

Regards,
Neil