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I took a quick look. The case reference matches with the cal. 354 movement. The case has been highly polished and the medallion seems worn, but that is common. A serial number in the 12-13 million range would be consistent with the age of the dial and case (circa 1952-4). If all 3 match up, then it's likely real.
I can't tell if the dial originally came in those colors, or is oxidized. From the outside, it looks in order. The seller has a good feedback percentage.
The price seems a bit high to me, but sometime you pay extra because it's want you want.
Hope this helps,