The 1973 100 rupiah was given an updated reverse design in 1978, reading 'HUTAN UNTUK KESEJAHTERAAN' (Forest for welfare), '1978' and a forest motif.
The coin was also made thinner, although its dimensions did not change.
This was the fourth and final Indonesian FAO coin.

The 1974 5 rupiah, meanwhile, was updated '1979', issued from March 1980, retaining its family planning message, but adding a circular decoration to both reverse and obverse of the coin, and being shrunk in size from 3.0 to 1.4 grams, presumably to cut the cost of production.
413 million coins were minted dated 1978, while 5 million were later issued dated 1995 and 1996.

The 1974 10 rupiah was similarly updated with decoration to '1979', enlarged with the composition changed to aluminium.
286 million were minted with this date.
No 10 rupiah coins have since been issued.
The 1973 100 rupiah was given an updated reverse design in 1978, reading 'HUTAN UNTUK KESEJAHTERAAN' (Forest for welfare), '1978' and a forest motif. The coin was also made thinner, although its dimensions did not change. This was the fourth and final Indonesian FAO coin.
The 1974 5 rupiah, meanwhile, was updated '1979', issued from March 1980, retaining its family planning message, but adding a circular decoration to both reverse and obverse of the coin, and being shrunk in size from 3.0 to 1.4 grams, presumably to cut the cost of production. 413 million coins were minted dated 1978, while 5 million were later issued dated 1995 and 1996.
The 1974 10 rupiah was similarly updated with decoration to '1979', enlarged with the composition changed to aluminium. 286 million were minted with this date. No 10 rupiah coins have since been issued.
Coins of the rupiah