I am a chrono owner and asked this same question after seeing that my HE valve was close to spot on with the 50 (just slightly below). Forum response was that chronos are located more in line with the 50 than non-chronos.
Check to make sure the band uses pins instead of screws. Many of the Omega fakes use screws. Look for space between date wheel and date opening. Many fakes have a definite space and genuine Omegas have a space that is Barely perceptible.
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