| Descrizione del dritto |
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. |
| Scrittura del dritto |
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| Legenda del dritto |
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| Descrizione del rovescio |
Uniface blank planchet; the reverse field is wholly devoid of any design, inscription, or device, presenting the bare aluminium-bronze metal surface in an unstruck state. Surface striations and toning consistent with pre-strike planchet preparation are visible across the field. No legend, denomination, or motif has been impressed. |
| Scrittura del rovescio |
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| Legenda del rovescio |
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| Bordo |
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| Zecca |
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| Tiratura |
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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.