Straight Razor Manufacturer, William Greaves, was in business by 1780. His sons joined the firm in 1816.
They then became William Greaves & Sons.
The Sheaf Works was started in 1823, and completed by 1826. (first factory in Sheffield)
The firm was sold to B.J.Eyre & Company in 1850, and they may have continued using the Greaves markings for a time (approximately until 1858).