The Rolex Caliber 1315 is a manual-winding mechanical movement designed in the late 20th century as part of Rolex’s 13xx series of compact calibers. It is the date-equipped counterpart to the time-only Caliber 1310. Built for ladies’ watches, the 1315 combines Rolex’s renowned precision and reliability with the practical convenience of a date function, all in a compact and slim design.

Used mainly in elegant and refined models like the Oysterdate Precision and Cellini, the 1315 continued Rolex’s tradition of mechanical excellence, even in its smallest wristwatches.

Technical Specifications

• Type: Manual-wind

• Functions: Hours, minutes, date

• Jewels: 17

• Frequency: 21,600 vibrations per hour (vph)

• Power Reserve: ~42 hours

• Shock Protection: KIF or Incabloc

• Chronometer Certified: No (often marked “Precision”)

• Quickset Date: No (date changes by rotating the hands past midnight)

• Hacking Seconds: No

The movement was engineered for watches in the 24 mm to 28 mm size range, with the date window typically placed at the 3 o’clock position.

Design and Movement Features

The Rolex Caliber 1315 offers both elegant simplicity and mechanical durability in a compact form:

• Rhodium-plated bridges and plates for long-term resistance to corrosion

• Three-bridge layout for mechanical balance and ease of service

• Compact calendar mechanism integrated under the dial

• Flat hairspring with manual regulation

• Free-sprung balance wheel, adjusted for long-term stability

• 21,600 vph beat rate, delivering smoother hand motion and better timekeeping

Even with the added date feature, the movement maintains a slim profile, ensuring the watches it powers remain light and elegant.

Watches Powered by Caliber 1315

The Caliber 1315 was used in:

• Rolex Oysterdate Precision (manual-wind) – small-cased watches with a classic Cyclops date magnifier

• Rolex Cellini Date models – typically in gold, with understated dial designs

• Rolex Geneve dress watches – in precious or two-tone metals

• Select Tudor Oysterdate watches, which sometimes used Rolex-designed movements and cases

Common features of these watches:

• Acrylic crystals with or without the Cyclops lens

• Time-and-date display, with no seconds hand

• Slim cases and bezels, favoring minimalism

• Leather straps or fine link bracelets

Service and Reliability

The Rolex Caliber 1315 is highly regarded for:

• Ease of servicing, due to its simple mechanical structure

• Reliable calendar mechanism, with few moving parts

• Long operational lifespan, especially when serviced every 4–6 years

• Strong performance, even decades after production

Watchmakers value it for its robustness and straightforward maintenance.

Collectibility and Appeal

The Caliber 1315 offers strong appeal to:

• Collectors of vintage ladies’ Rolex watches

• Enthusiasts seeking a classic mechanical timepiece with a date function

• Buyers interested in manual-wind watches with traditional craftsmanship

• Those looking for a compact, vintage Rolex that isn’t quartz

Its value is most influenced by the condition of the dial and case, especially when housed in gold or two-tone Oyster or Cellini models.

Final Thoughts

The Rolex Caliber 1315 is a refined, date-equipped manual-wind movement, designed to deliver reliability and function in a compact case. It represents Rolex’s commitment to offering mechanical excellence in every size, from large professional watches to discreet ladies’ dress pieces. For collectors or wearers who appreciate vintage elegance, subtle functionality, and proven mechanical performance, the 1315-powered watches offer timeless appeal with Rolex pedigree.