AP ultra thin

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https://www.sothebys.com/en/buy/auction/2020/watches-online/audemars-piguet-an-ultra-thin-white-gold

Hello,
I am interested in the above watch at Sotheby’s. It is supposedly a 1985 watch, but the dial has me a bit concerned. In particular, the “Swiss” signature instead of “Swiss made” reads to me as a potentially older dial. Moreover, I cannot find another example of the cross hatched case.

can anyone shed some light on this? I will attach a picture .
Thanks!