Patek Philippe
Patek 315 SC
Swiss lever · introduced 1977
Beat rate
21,600 vph
Power reserve
48h
Jewels
29
Introduced
1977
Escapement
Swiss lever
The cal 315 SC powered the Calatrava for decades as Patek's standard automatic with center seconds and quickset date. All surfaces receive Côtes de Genève, beveling, and anglage, consistent with Patek's Seal requirements. The "SC" designation indicates center seconds via a friction-fitted wheel, a traditional layout that remains in the movement architecture to this day.
Specifications
Beats per hour
21,600
Jewels
29
Power reserve
48h
Diameter
27.0mm
Height
5.25mm
Escapement
Swiss lever
Introduced
1977
Finishing
Haute horlogerie
Service interval
8 years
Service cost tier
Haute
Complications
datequicksetcenter seconds
Known service issues
- Center seconds friction fit can allow creep under temperature cycling; regulated at factory service
- Mainspring barrel pivot wear is reported on high-mileage examples after 20-plus years without service
Notable in
- Patek Philippe Calatrava 5117R
- Patek Philippe Aquanaut 5065A (early production)
- Patek Philippe Calatrava 5127G
Buying advice
Practical guides for buying a watch with this caliber on the pre-owned market: