Rolex Day-Date 18078 Bark Finish "1987"

Rolex Day‑Date 18078 “Bark Finish” — Spec Sheet

Model / Reference: 18078 (bark finish variant)
Era: ~1980s (your example ~1987)

Case & Exterior

• Material: 18K yellow gold

• Case diameter: 36.0 mm

• Case design: Oyster style, screw-down crown

• Crystal: Sapphire

• Bezel & finish: “Bark” textured finish (rough, organic texture rather than fluted or polished)

• Bracelet: 18K yellow gold “President” (3‑link style) with matching bark-textured center links

• Dial: Champagne or matching tone, applied hour markers (batons in many examples)

• Day display: Full day name at 12 o’clock

• Date display: Date window at 3 o’clock with magnifier (“Cyclops”)

Movement & Performance

• Calibre: Rolex 3055

• Movement type: Automatic, self-winding

• Jewels: 27

• Beat rate: 28,800 vph (4 Hz)

• Power reserve: ~ 42 hours (typical)

• Functions: Hours, minutes, seconds; day & date

• Date quickset: Yes (single quickset for date)

• Day setting: Via hour/minute hands (not independently quickset)

Other

• Water resistance: ~ 100 meters (as per Oyster standard, though vintage condition may reduce it)

• Condition sensitivity: Bark texture softens with polishing/servicing

• Variability: Some examples differ in dial color, marker style, or minor finishing depending on factory option or aftermarket changes