Hmmm... Look at the date window. It has that rhomboid shape reminiscent of the Speedmasters made exclusively for the Japanese market. Perhaps the second hand is another Japan-only variation?
I believe if you look around a bit you will find that the current model has a green hand with no frame around the date window. The previous "golf" edition had the frame around the date window and just the tip of the second hand was green.
No, it should not. The model number on the warranty and pictogram cards are for the earlier 8500 AT's, which have the window around the date as @Flingit1200s already mentioned. See the model here: https://www.omegawatches.com/watches/seamaster/aqua-terra-150m/co-axial-415-mm/23110422101001/
However, what this model SHOULD have is the bracelet. The strap supplied is an aftermarket, and cannot confirm if the clasp is authentic Omega.
Long answer: this is the 8500B version, where only the tip of the second hand is green to match the text on the dial.
You're thinking of the 8500G version that has no date border and the whole second hand is green.
B and G differences are only going to be in the shape of the coaxial wheel and the lack of nivagauss/amagnetic material in the movement (meaning it's not Master Coaxial).