During the reign of Sultan Muhammad Jiwa Zainal Abidin Muazzam Shah (1710 - 1773), animal money made of tin was introduced in Kedah. This form of currency was restricted to models of the fighting cock which was perched on a number of rings attached to it's base. The model was also known as 'Duit Ayam'.

In the 1750's, the currency of Kedah was also consisted of models of the fighting cock made of tin and perched on a number of rings. These tin cocks perched on five rings were the equivalent of ten cents of the Spanish Dollar. The rings on the cock could be broken off and used separately. Each ring represented a unit of currency.

From the few records avaiable, it was known that the fighting cock itself was worth five cents of the Spanish Silver Dollar which each attached ring below added a further one cent to it's value. For small purchases the metal rings were broken off and used as one cent pieces. A few pieces of this tin cockerel on rings were still in circulation as late as the 1850's when each ring was worth 10 pieces of the Singapore Merchants one Keping tokens.

1 Tin Cock = 5 cents of Spanish Silver Dollar
                  = 50 Singapore Merchant Tokens

1 Tin Ring = 1 cents of Spanish Silver Dollar
                 = 10 Singapore Merchant Tokens 

In the 1670's, Thomas Bowrey published a report which gave the value of Kedah currency:

96 Tarra (tin-copper) = 1 Copan (Kupang) gold
3 Copans (Kupangs) gold = 1 Spanish 8 Reales (Silver Dollar)
4 Copans (Kupangs) gold = 1 Mace

According to Logan, in 1850 the scale of values for the tin cash or tra:

160 tra = 1 tali (a string of cash)
1,280 tra = 1 Spanish 8 Reales (Silver Dollar)

By 1899, the exchange rates for Kedah, Perlis and Setul according to Temple was

4 tra = 1 Doit or 1 Keping
40 tra or 10 Doits = 1 Kenderi (unit of account)
1,280 tra = 1 Spanish 8 Reales (Silver Dollar)