Here it is - my first Seleucid Tetradrachm

I dug through ACsearch and found your coin at auction back in 2017 at a weight of 16.7 g. It could be that it was a mistake on the part of the auction house you purchased it from. I am also found a few examples of the Susa tetradrachm in the eight range of your coin. The one below is a little over 16.8 g.

Do you have any other concerns about the coin notes that you have it in hand?

 

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Also in the name of Seleukos I Nikator, the same type as the one posted by Andres2:
In Eastern Seleucid Mints, E.T. Newell has this coin in Series 1, Group A. He suggests a date of 305 - 304 BC. Martin J. Price lists a coin in the name of Alexander the Great (3784) with the exact same monograms. He suggests a date of ca. 295 BC for the coin, but admits the whole attribution is very tentative.

Seleukeia on the Tigris, 305 - 300 BC
16.82 g, 26 x 27 mm
Ref.: Price (Alexander) 3784; SC 117c; Newell, ESM 12, 4; BMC 4.1, 5; Houghton 941; HGC 9, 12i
Obverse: Alexander the Great as Herakles facing right, wearing the Nemean lion skin headdress, horns curling around ears. Border of dots.
Reverse: Zeus Aëtophoros seated on throne to left, holding eagle in outstretched right hand and scepter in left, a symbol of his authority. ΣΕΛΕΙKΟΥ; to left monogram and ΔI monogram below throne. In ex. ΒΑΣΙΛΕΩΣ (of the King). Border of dots.