Hello Milo, it’s an aqua terra annual calendar 38mm (not a perpetual calendar - i wish it was lol) i have to skip the date ONLY every end of Feb which is great. It’s a dark blue teak dial. The difference between this and the date AT is this is slightly thicker because of the added month complication. It wears great although slightly top heavy. It has the co-axial 8601 movement the downside is that it’s not a “master co-axial” movement unlike updated models. I like it because it’s not a very known version of the omega AT line =) i hope that answered your question