Pound sterling
During the Great Depression in 1933, the kroon went off the gold standard, devalued 35% and obtained a currency peg with the Pound sterling (GBP) at 1 GBP = 18.35 kroon. The Estonian kroon kept this peg and circulated until the Soviet occupation of 1940. The kroon was exchanged for the Soviet ruble at a rate of 1 ruble = 0.8 kroon.