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>> No.54404831 [View]
File: 409 KB, 870x1300, Heraeus_Kinebar5g_b.jpg [View same] [iqdb] [saucenao] [google]
54404831

>>54404784
The obverse is normal (pic related). The reverse is etched with fine lines creating the prismatic effect. Wikipedia has an entry on Kinebar if you want details.

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