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.
Non chronos, i.e. the regular 2531.80 should have the He valve a bit above the 10 o'clock, certainly not aligned with it. The Chrono has the valve more closely aligned. Hope this helps!
I wasn't suggesting that I have a fake, just curious after seeing the image because I've read on here that the valve is often wrong on fakes.
Looking at my watch again, the position is subjective dependant on the angle you look at and my attempts at taking photos have the valve all over the place!
There are some pretty clued up people on here who can take one look at scream fake. I would just like to learn from them but need it spelled out a bit.
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