Auctioneer Simon Drieu said that there was a lot of interest in the unusual item when it went under the hammer at Glencoe last Wednesday.
Four bidders drove up the price from £600 to £6,100, watched by a crowd of more than 300.
The water tank, which is about four feet tall and three feet wide, features the initials ‘W.W’, the stamped date 1737 and dolphin, shellfish and strap-work decoration.
