Compare the watch you bought, which by the way is one of the best Hydroconquests I've seen on Ebay with the one below.
The serrations on yours was on both sides ie at 15 and 45 but the fake ones are at 12 and 6, 90° out position.
The lume pips on the fake one aren't applied as evenly on the fake one and the Longines font on the dial isn't as thin either.
The movement pics show the stem release button.
The correct one in the middle with a continuous arrow, the fake one on the right is broken.It's only a slight difference but it's there
The black one at the bottom is mine.
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