Coins have been the most widely used monetary format in history. And due to Indonesia's colorful past - full of Imperialism, political upheaval and economic volatility - it has produced an incredible variety of coins.
If you look closely, a lot can be learned just by looking at the constantly changing nature of coins.
Here are 19 fascinating coins from Indonesia's past...
This Dutch East Indies artefact is called a "½ Duit"... Probably not worth much then but priceless now!
"1 Duit" again, from the Dutch East Indies.
This Sumatran relic is known as "1 Keping." Many merchants traded it in Singapore during the spice trade.
5 cents, from the Dutch East Indies.
Dutch East Indies, 1 cent.
A final gem from the Dutch East Indies era, 1/2 Cent.
Indonesia, 50 sen - This was before the rupiah was the only form of currency.
This special 1 sen coin was only used in West Papua. Nowhere else in Indonesia was Sukarno's head used on the 1 sen coin.
Indonesia, 2 Rupiah - How little would 2 Rupiah be worth now?
This medal was privately issued by a nickel mining company operating in West Papua! The medal was struck by the privately owned Sherritt mint in Fort Saskatchewan, Alberta, Canada.
Indonesia, 10 rupiah - Symbolising the "National Savings Program."
Indonesia, 100 rupiah - A coin for "Forestry for Prosperity."
Indonesia, 5 rupiah, - A coin commemorating the "Family Planning Program."
Indonesia, 500 rupiah.
Indonesia, 1000 rupiah. Perhaps modern Indonesia's most solid, sexy coin
Indonesia, 100 rupiah
Indonesia, 200 rupiah. Now we get to something more familiar!
Indonesia, 1000 rupiah - Celebrating the traditional Indonesian instrument, the Angklung.