100 Rupiah Blank Planchet

Blank planchets escaping a mint facility are typically the result of a breakdown in the ejection or inspection stage — the striking press feeds the prepared disc, something interrupts the cycle, and the blank exits unchecked. Bank Indonesia's Perum Peruri facility in Jakarta produced the 100 Rupiah aluminium bronze series through this period under high-volume pressure, with annual mintages running into the hundreds of millions. A planchet at this weight and alloy that cleared the building without a strike is a mechanical failure, not a variety — but it is a documented one.