Bank of Taiwan, an initial engravers working on transparent acetate showing the outline of a plate design for the obverse of 500 Yuan, ND (1976), showing the outline of the head of Sun Yat-sen, rather than Chiang Kai-shek who actually featured on the note, unique and a remarkable survivor, as most were simply treated as printers waste
TBB B387 (Taiwan), Pick 1985 (China) £100-£150

This items is photographed on a white background to show it properly, but is an etching on transparent acetate (plastic). No returns will be accepted on grounds of failing to read or understand the description.