Logbook keepers would note the number of whales seen and caught by stamping in the logbook. This stamp is carved out of wood. On one end it has a Sperm whale and on the other it has a whale's tale. The tail stamp would be used to show they had seen but not caught a whale. The Sperm whale stamp would be used to indicate they had caught a whale. This stamp has a cut-out in the whale's body into which they would write with ink how many barrels of oil the whale produced.