Need help/opinion - Buying pre-owned Omega AT 2019 in Korea

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Hi, I am thinking of buying pre-owner Omega AT Cal8900 2019 here in South Korea.

I am a bit worried if the watch is authentic or not. Attached link to the watch which is sold through a thrift shop locally.

https://m.gugus.co.kr/shopping/goodsview.asp?goods_num=9241811

Serial number on the watch matches the warranty card which is stamped by AD in Bahrain. Understand from seller that the watch was bought new from grey market dealer watchlounge.kr

Anyone with experience with above websites or if someone could help to authenticate the watch by looking at the pictures from the link