OK, I apologize for the quick response. I took another look. It's a mess.
The currency is Real (1655-1822), but the coin is dated ND (1582). There are two coins in Numista before 1758, this coin and a similar version with the same denomination. Jamaica was under the control of Spain until 1655, then under the England until 1707, then under the United Kingdom until independence.
All the coins in Numista between 1655 and 1822 were issued 1758-1773 (most 1758) and denominated in Pence, Shilling, and Pounds. Some are “6 Shillings 8 Pence - George II Mexico - 8 reales; counterstamped”. That puts 1 Real as 10 Pence.
Krause (1701-1800) says:
4 Farthings = 1 Penny
12 Pence = 1 Shilling
8 Reales = 6 Shillings, 8 Pence
There are two sets of coins in KM, 1758-1759 in Pence, Shilling, and Pounds and 1773 8 Escudos. The 1773 are described in Numista as “5 Pounds Peru - 8 escudos; counterstamped”.
Next book has farthings, ½ pence, and pence starting 1869 (but the currency still mentioned Reales). Numista has Pound (1822-1969).
Krause lists nothing for Jamaica in 1601-1700. So no Real coins listed.
My proposal for currencies:
- Real (1494-1655) (new date range) (no subdivisions)
- Pound (1655-1969) (new date range) (4 Farthings = 1 Penny, 12 Pence = 1 Shilling, 20 Shillings = 1 Pound)
- Dollar (1969-date) (unchanged)
The first banknotes were issued in 1822, but other than that I don't find anything significant happening to the currency or history of Jamaica or the UK in 1822.