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100 Rupiah Blank Planchet
| Issuer | Bank Indonesia |
|---|---|
| Year | 1991-1998 |
| Type | Coin pattern |
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| Currency | Log in to see details |
| Composition | Log in to see details |
| Weight | Log in to see details |
| Diameter | Log in to see details |
| Thickness | Log in to see details |
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| Obverse description | Uniface blank planchet; the obverse field is entirely uninscribed and undesigned, retaining the raw aluminium-bronze surface as prepared prior to striking. The field exhibits characteristic milling marks and die-contact striations consistent with an upset planchet blank. No legend, effigy, or device of any kind is present. |
|---|---|
| Obverse script | Log in to see details |
| Obverse lettering | Log in to see details |
| Reverse description | Log in to see details |
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| Edge | Plain |
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| Additional information |
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.