Puzzle jugs go back to medieval times but seem to have become particularly popular in the 18th century. The number of spouts can vary from  one (typified by Donyatt slipware) to six (or more) on Nottingham or Derbyshire products. The majority of sprigged puzzle jugs are from Derbyshire as they don't seem to have been popular with London potteries.  I illustrate a number of typical examples.