Now, there is sufficient justification to go beyond this chronological affirmation to understanding the exchanges of glyptic traditions between two contemporaneous contact areas – Mesopotamia and Indus. A good starting point is the discovery of a storage pot in Susa (Elam) with an Indus script hieroglyph: fish.
Susa pot showing the interaction areas of Meluhha, Magan, Dilmun and Mesopotamia (After Maurizio Tosi, 2010). This storage jar has a FISH glyph inscribed on the pot. This pot contained metal artefacts. See the two slides of Maurizio Tosi (2010). The slides were presented by Prof. Maurizio Tosi (2010: The middle Asian intercultural space and the Indus civilization: a comparative perspective for a definition of diversity) in the international conference held in Delhi between 25 to 27 November 2010)
http://www.vifindia.org/sites/default/files/Abstract_22_11_10.pdf “There is a solid archaeological evidence that trade and exchanges took place among all this regions and the Indus plains during the whole of the formative period.” The 'fish' glyphic is a glyph of the civilization denoting ayo, ayas 'metal' of the Indian sprachbund or Indian linguistic area. Fish + crocodile is read as: ayakaara 'metal smith' (Pali).
Fig A.1 Map of the Indo-Iranian borders illustrating the principal sites (e.g. Amri, Tepe Yahya, Tell Abraq, Susa).
…B. Buchanan has published a tablet dating from the reign of Gungunum of Larsa, in the twentieth century BC, which carries the impression of such a stamp seal. (B.Buchanan, Studies in honor of Benno Landsberger, Chicago, 1965, p. 204, s.). The date so revealed has been wholly confirmed by the impression of a stamp seal from the same group, fig. 85, found on a Susa tablet of the same period. (P. Amiet, Antiquites du Desert de Lut, RA, 68, 1974, p. 109, fig. 16. Maurice Lambert, RA, 70, 1976, p. 71-72). It is in fact, a receipt of the kind in use at the beginning of the Isin-Larsa period, and mentions a certain Milhi-El, son of Tem-Enzag, who, from the name of his god, must be a Dilmunite. In these circumstances we may wonder if this document had not been drawn up at Dilmun and sent to Susa, after sealing with a local stamp seal. This seal is decorated with six tightly-packed, crouching animals, characterised by their vague shapes, with legs tucked under their bodies, huge heads and necks sometimes striped obliquely. The impression of another seal of similar type, fig. 86, depicts in the centre a throned figure who seems to dominate the animals, continuing a tradition of which examples are known at the end of the Ubaid period in Assyria... Fig. 87 to 89 are Dilmun-type seals found at Susa. The boss is semi-spherical and decorated with a band across the centre and four incised circles. [Pierre Amiet, Susa and the Dilmun Culture, pp. 262-268].
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Glyptic art and glyptic writing in contact areas of Indus script hieroglyphs