Side by side

Seestern S446 GMTvsLongines ULTRA-CHRON CLASSIC

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

S446 GMT
SeesternS446 GMT
MSRP $299
ULTRA-CHRON CLASSIC
LonginesULTRA-CHRON CLASSIC
MSRP $3,900

At a glance

22 of 29 specs differ
Diameter
S446 GMT39.5mm
ULTRA-CHRON CLASSIC37mm
Power Reserve
S446 GMT41hh
ULTRA-CHRON CLASSIC52h
Water Resistance
S446 GMT100m
ULTRA-CHRON CLASSIC50m
MSRP
S446 GMT$299
ULTRA-CHRON CLASSIC$3,900

Full specifications

Case

9 specs
Category
GMT
Diameter
39.5mm
37mm
Thickness
13mm
10.95mm
Lug-to-Lug
47mm
44.6mm
Lug Width
20mm
19mm
Material
316L Stainless Steel
Stainless Steel
Finish
Brushed and polished
Water Resistance
100m
50m
Caseback
Solid
Screw-down case back

Crystal & Dial

5 specs
Crystal Shape
Domed
AR Coating
Inner
Both sides
Dial Color
Cream
Silver
Indices
Applied
Applied indexes
Lume
None
Super-LumiNova

Movement

7 specs
Caliber
Seiko NH34A GMT
L836.6
Beat Rate
3 vph
36,000 vph
Power Reserve
41hh
52h
Jewels
24
0
Hacking
Yes
No
Hand-winding
Yes
No
Complications
GMT, Date
Hours, minutes, seconds and date

Pricing

1 specs
MSRP
$299
$3,900

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Seestern S446 GMT

Owners widely praise the Seestern S446 GMT for its stunning finishing and extreme value, with a sapphire crystal and adjustable clasp. The winding action is noted as buttery smooth, and the 39.5mm case size is considered very wearable. Some owners, however, flag the lume as a weak point and one owner found the bracelet clasp lacked sufficient micro-adjustment. The Seestern S446 GMT is considered an extreme value for the dollar. Overall, owners rate the Seestern S446 GMT highly for its exceptional finishing and value proposition at its price point.

Longines ULTRA-CHRON CLASSIC

The Longines ULTRA-CHRON CLASSIC is widely praised for its faithful retro design, high-beat 5Hz movement offering greater precision and a smooth seconds hand, and its value proposition as a new 5Hz watch. Reviewers highlight the L836.6 caliber's TimeLab "ultra chronometer" certification for superior accuracy and shock recovery, and owners find the bracelet very comfortable with easy micro-adjust. Some owners note the design appears dated, and one reviewer points out the dial lacks luminescence and water resistance is only 50m. Owners are split on sizing, with some finding the 40mm case wears larger than expected and recommending the 37mm version. Overall, owners and reviewers rate the Longines ULTRA-CHRON CLASSIC highly for its blend of vintage aesthetics, modern high-beat movement performance, and comfortable wearability.

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