Indonesian 50-rupiah coin

The fifty rupiah coin (Rp50) is a denomination of the Indonesian rupiah. It was first introduced in 1971 and last minted in 2003. As of 2020, only aluminum Rp50 coins dating from 1999 through 2003 remain legal tender, although it is rarely seen in circulation due to its extremely low value.

First issue (1971-1990)
The Rp50 coin was first introduced in 1971 as a cupronickel coin that weighed 6.06 g, had a 24 mm diameter, was 1.5 mm thick, and had a milled edge. Its obverse featured the lettering "BANK INDONESIA," "50 RUPIAH," and "1971," as well as two stars, while its reverse featured the lettering "Rp50" and a portrait of the greater bird-of-paradise (Paradisea apoda). A total of 1,035,435,000 coins were minted. These coins were demonetized on June 25, 2002, and were redeemable in commercial banks until June 24, 2007 and Bank Indonesia offices until June 24, 2012.

Second issue (1991-1998)
In 1991, the Bank of Indonesia issued an aluminum-bronze Rp50 coin that they minted until 1998. It weighed 3.18 g, had a 20 mm diameter, was 1.58 mm thick, and had a reeded edge. Its obverse featured the national emblem Garuda Pancasila as well as the lettering "BANK INDONESIA" and the year of issue (e.g., "1996") while its reverse featured a portrait of the komodo dragon (Varanus komodoensis) and the lettering "Rp 50" and "Komodo." These coins were demonetized on November 30, 2006, and were redeemable in commercial banks until November 29, 2011 and Bank Indonesia offices until November 29, 2016.

Mintage figures of this coin are as follows:

Third issue (1999-2003)
In 1999, the Bank of Indonesia updated the Rp50 coin, with its material changed to aluminum and its reverse now showing a portrait of the black-naped oriole (Oriolus chinensis) as well as the lettering "KEPODANG" and "50 RUPIAH"; its obverse remains the same (depicting the national emblem Garuda Pancasila, mint year (e.g., "2002"), and lettering "BANK INDONESIA"). These coins were minted until 2003, and weighed 1.36 g, had a 20 mm diameter, were 2 mm thick, and had a smooth edge.