Just to throw in another wrench in the question, here is a shot of a 5th century BC Greek cup showing a Greek soldier fighting a Persian. Notice the Persian, not the Greek is wielding a kopis-like sword. The cup, help in the Antikenmuseum Basel und Sammlung Ludwig museu (# BS 480) is dated to 480 BC, over a century earlier than Alexander. At the time the Persian Empire extended to the Indus River, so we may consider this form of sword having being known in India much earlier than Alexander's incursion.
Food for thought...
Emanuel
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