Platinum is a rare metal to find on any Patek Philippe sports watch model, as not many were manufactured. Notably, every inch of the case is in platinum, from the case to the bracelet and even the bracelet pins themselves. The use of this metal invokes a truly luxurious impression that might seem jarring for a typical sportswatch, but on the reference 3800, it has an effortless presence on the wrist that does not feel at odds with the style of the watch.
In many ways, the reference 3800 is a scaled-down version of the original reference 3700, retaining many of the same features, from the ridged dial to the overall proportions. Finding such a classic version of the dial in a platinum case is equally as rare, and even more so that this style of dial is correct to the watch, as demonstrated by the Extract from the Archives. Furthermore, rather than the typical four hallmarks on the caseback found on other examples of this reference, there are two hallmarks found on this watch.
The blue ridged dial displays horizontal grooves with a deep blue and grey colouration. The applied hour markers are tritium-filled, with "dot" outer-minute divisions, and a date aperture at 3 o’clock. The latter features the original, black date disc, which blends effortlessly into the rest of the dial, also sets this example apart. It is speculated that the darker date discs used are part of earlier production runs, suggesting that this watch is an early example of the piece.
With this example, the index-markers and hands are manufactured from white gold, as indicated by the "σ · SWISS · σ" signature at the bottom of the dial. Three types of signatures exist for the reference: “σ SWISS σ", "σ · SWISS · σ" and “SWISS”. This is to signify the use of gold on the dial, in the form of applied markers. It is safe to say that any watch produced prior to 1995 which has gold on the dial – that is to say all ridged dials with applied indexes – should feature one of the two sigma signatures.
As a result of Patek Philippe's decision to develop its own in-house, ultra-slim movement, the reference 3800 features an updated calibre 335 S C (for “seconde centrale” or “central second”), replacing the previous calibre 28-255C movement. The calibre 335 S C features 29 jewels, a straight-line lever escapement, monometallic balance; adjusted to cold, heat, isochronism, and 5 positions, a self-compensating flat balance spring and shock absorber mechanism. Furthermore, the solid-gold rotor is finished in classic Patek Philippe style, with circular Geneva stripes.