This is an original mid to late 1700's whetstone carrier that was made from cow horn. It has a wonderful patina on the interior and the exterior and was always a whetstone carrier.  It was never a drinking cup because of the roughness of the interior of the horn. These carriers were used by the early colonists to sharpen their scythes and sickles while in the field. They could be carried on their belts with a wrought iron carrier that was attached to the horn as can be seen in the pictures. It is a true piece of early American history. It is 8" long from tip to base.