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Wt = 16.33g. Diam = ~32mm. D. José I (1750-1777), Tutenag XII Réis 1769.
Ref.: Gomes 23.01 |
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Photo from Zeno posted by Lingen who
added: Tutenag is an aloy used for coins of
low value. It has the appearance of tin, and therefore often as such be
defined in many catalogues. Gerson da Cunha Contributions to the study of Indo-Portuguese Numismatics, Bombay 1883, describes the alloy as 40.4% copper, 25.4%
zinc, 31.6% nickel and 2.6% iron. Recent X-ray fluorescence (XRF) analysis of
a number tutenag coins of 20 bazarucos, produced at Diu during the period
1768-1827, indicates a much higher zinc content (70-94%) and only 0.1-0.4%
copper and no nickel at all. See: T.D. Yih and J. de Kreek, Preliminary data
on the metallic composition of some S.E.-Asian coinage as revealed by X-ray
fluorescence (XRF) analyses, Spink Numismatic Circular CI-1 (7-9), London 1993. |
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