Guide

Watches with a 70-hour-plus power reserve

8 references

Power reserve is how long a fully wound watch keeps running before it stops. For decades, 40 to 50 hours was typical, so a watch taken off on Friday evening would often have stopped by Monday morning.

Many newer movements reach 70 hours or more. The gains usually come from more efficient escapements, longer mainsprings or a lower beat rate, sometimes traded against other properties.

We list every reference fitted with a caliber whose power reserve is sourced at 70 hours or more.

The list

Listed by brand, then reference number. The order is alphabetical, not a ranking.
SBGA211 Current

Grand Seiko · Heritage

Snowflake

Diameter
41 mm
Movement
Spring drive
H70455133 Current

Hamilton · Khaki Field

Khaki Field Murph

Diameter
42 mm
Movement
Automatic
126610LN Current

Rolex · Submariner

Submariner Date

Diameter
41 mm
Movement
Automatic
126710BLRO Current

Rolex · GMT-Master II

GMT-Master II

Diameter
40 mm
Movement
Automatic
M79230N Discontinued

Tudor · Black Bay

Black Bay

Diameter
41 mm
Movement
Automatic

How we picked

Included: references linked to at least one caliber whose power reserve carries a recorded source and is 70 hours or more. References with no linked caliber, or an unsourced power reserve, are left out.

Watchfari holds no prices, reviews or test results, so nothing here is ranked by quality or value. Many values come from a hand-curated seed that has not yet been checked against a primary source; each reference page shows where every value came from.

Questions

How many long-power-reserve watches does Watchfari list?
8 references from 4 brands meet this guide's criteria in the current catalogue. Most represented: Grand Seiko (2), Hamilton (2), and Rolex (2).
What case sizes do these long-power-reserve watches come in?
Among the 8 references with a sourced case diameter, sizes run from 37.3 mm to 42 mm, with a median of 40.5 mm.
Are these long-power-reserve watches still in production?
7 are listed as current and 1 as discontinued, going by sourced status values. Check with the brand before relying on availability.
Which movement types appear among these long-power-reserve watches?
By sourced movement type: automatic 5, manual 2, and spring drive 1.