Original sentence: It was equivalent to 4 shillings 2 pence sterling and replaced the guilder at a rate of 1 dollar = 3⅛ guilder.The dollar was introduced in 1839
Edited sentence: A particular feature of the circulation of British silver coins in British Guiana was the popularity of the 4d (four pence) coin.From 1917 these were struck exclusively for use in British Guiana.The dollar as a unit of account was introduced in 1839 in order to facilitate the introduction of British sterling silver coinage.The dollar unit was equivalent to 4 shillings 2 pence sterling and replaced the guilder at a rate of 1 dollar = 3⅛ guilder.The explanation for this lies in the fact that the dollar unit of account acted as a convenient intermediatory conversion unit between sterling and the outgoing Guilder unit.This was a direct consequence of its equivalence to the very popular outgoing 'Bit' coin which was equal to one quarter of a guilder.When 4d coins ceased to circulate in the United Kingdom in the latter half of the nineteenth century, special 4d coins were struck for use in the British west Indies and British Guiana