Patek Philippe Nautilus 3800/1A-XII
The Patek Philippe Nautilus 3800/1A-XII takes a strap made to measure on the watch itself: the bracelet is part of the case, so no band bought by millimetres will fit.

Patek Philippe · Nautilus
The Patek Philippe Nautilus 3800/1A-XII takes a strap made to measure on the watch itself: the bracelet is part of the case, so no band bought by millimetres will fit.
Have yours made at the atelier- Lug width
- integrated bracelet
- Case diameter
- 38 mm
- Reference
- 3800/1A-XII
- Family
- Nautilus
- Case material
- Acciaio
- Model
- Nautilus 3800 Stainless Steel / Black - Roman
Sizing notes
- The bracelet is drawn as part of the case, so there is no lug width to match and no catalogue band will go in. A strap is still possible: it is cut and fitted on the watch in the atelier, from the case measurements taken by hand. Why no strap fits an integrated bracelet →
Why no standard band fits this one
On the Patek Philippe Nautilus 3800/1A-XII the bracelet is drawn as part of the case: the first link continues the case profile instead of sitting in a gap between two lugs. There is no lug width to match, so there is no size to order, and a band bought by millimetres will not go in whatever the number.
It is not a rare way to build a watch. 158 Patek Philippe references in the database are built this way, and across every brand it is 5.7% of the catalogue. What replaces the bracelet is a band cut to this case, shaped to close the opening the way the bracelet did.
Other Nautilus references
- Nautilus 7010 Rose Gold - Diamond / Purple010/1R-013
integrated - Nautilus 37003700/1A

- Nautilus Power Reserve 37103710/1A-001
integrated - Nautilus 5711 Platinum - Baguette / Grey5711/110P-001
integrated - Nautilus 5711 Stainless Steel - Baguette / Green5711/1300A-001
integrated - Nautilus 5711 Children Action5711/1500A-001
integrated