c1978 Serviced ROLEX Vintage DateJust 1601 σ Rail Dial 36mm cal.1570 #1605

Condition Rank : Very Good
(Full serviced on August 10, 2026)

[Description of services]
Full disassembly, cleaning, inspection, lubrication, and assembly.

[Originality Verified] - Authentic Original
This Rolex Datejust Ref.1601 is judged original and period-correct in its main configuration.

[Features]
Rolex Datejust Ref.1601 / cal.1570 (w/hack) / 19,800 bph / 36mm case (excluding crown) / 20mm lug
Year of manufacture: c.1978 / Serial No: 513xxxx
30m water-resistance test passed.

[Collector’s Notes]
The dial has sigma marks at 6 o’clock, indicating the use of gold on the dial furniture.
It is also a so-called rail dial, where the two chronometer lines create a distinct vertical split through the center. This layout is sometimes called “center split” in Japan.

[Dial] : Excellent
It appears original. No clear signs of redial, repainting, or relume.

[Hands] : Very Good
They appear original, with no clear signs of replacement or relume.

[Crystal] : Very Good
Plexiglass.

[Case, crown and back of the case] : Very Good
Crown screw-in is good (approx. 1.2 turns to unlock). The serial engraving is clear.

[Band] : New
New aftermarket leather strap, not Rolex.

[Action] : Very Good
Automatic winding, hand-winding, time-setting, and date change around midnight work properly.

[Accuracy] : Very Good
About -3 to +13 sec/day. (Measured by Timegrapher)