Patek Philippe - A rare and possibly unique "Top Hat" wristwatch with sapphire numerals

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Ref:1450, Case No. 688587, Movement No. 977'411, Manufactured in 1960
18-jewel Cal. 9"'-90 movement adjusted to temperature, position and isochronism, stamped twice with the Geneva Seal, rectangular textured gold dial, applied baguette sapphire numerals, polished hands, snap back "Top Hat" case, integral 18K gold textured bracelet, with original maker's presentation box and undated Certificat D'Origine et de Garantie, case, dial and movement signed