Professor Michael Costa wrote in his book (the gold section, Solomon’s seal and star of David, Poalim,1990 [in Hebrew] p. 229) that the hexagram appeared
as an ornament on different vessels in France in the Bronze Age, between 6000 and 1000 B.C.E. Source: Dawkins W.B. 1880
It is not clear from his phrasing if there was any hexagram which is dated to 6000, but if that’s the case we are talking here about the first hexagram. This is of the highest importance point so readers who know more about this hexagram are invited to comment.