(from
here):
1. The O in the AML Seiko Logo is always oval and lays on its side.
2. The "Chronograph Automatic" Text and the Seiko Logo are centered on the left side, draw an imaginative vertical line from the S to the C and A ( think like MOY-Test on some of the connys).
3. the Date surround is silver and the insides of the cutout are painted as well (on most of the aftermarket ones it's just a stamp through the metal).
4. color of the date disk should be an off white, not a bright one.
5. there should be tritium Spots on all hour markers.
6. the hour markers have black (not sure if onyx) stripes on top of them (there is some controversy about that).
7. Concerning the Hands, those should be straight, syringe and not tapering down to the front. The subdial hands should have a visible metal "disks" in the middle where they are mounted. Chrono second hand is square base with orange tip (can be faded heavily, I've seen almost white ones).
8. The dial it self should have a vertical linen pattern.
The subdials do not have concentric circles! If they do, that's a dead giveaway for an aftermarket dial!
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