PATEK PHILIPPE. A STAINLESS STEEL AUTOMATIC WRISTWATCH WITH SWEEP CENTRE SECONDS, DATE AND BRACELET

Reference 3800 was in production from 1981 until 2006 and available in different versions. It pays homage to the original Nautilus reference 3700 with a similar design and aesthetic except in a smaller size case and with the addition of a centre seconds hand made possible by the introduction of cal. 335 SC.
Ref.3800 is illustrated in the 'Blue Book 4', 2020 edition by Eric Tortella, page 486 & 509-