Vintage blue Devon ware ceramic puzzle jug. 
A trick or puzzle as to how to drink from it without spilling the contents (by a combination of covering the holes in rim and handle with fingers).
Wording on the jug says: 
"This jug was made your skill to try,
drink if you can when you are dry".
From Barnstaple, Devon
dimensions are approximately: 
height: 4 1/4 inches, top inside diameter: 1.5 and the base diameter: 2 inches.