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Seiko watch · Presage · automatic

Seiko SSA343

The Seiko SSA343 measures 40.5 mm across and 14.4 mm thick, with 20 mm lugs.

Sources checked · How we source numbers
Case
40.5 mm1
Lug to lug
not published by Seiko
Thickness
14.4 mm1
Lug width
20 mm1
Seiko SSA343: size drawingSeiko SSA343, round case, top and side view to scale: case diameter 40.5 mm, lug to lug — (unknown), lug width 20 mm, thickness 14.4 mm. Bezel, dial and crown size are schematic.lug width 20Ø 40.5lug to lug —TOPthickness 14.4SIDE
Seiko SSA343, top and side, to scaleDrawing from data, not a photo · mm

Seiko SSA343 specifications

Case diameter
40.5 mm1
Lug to lug
not published by Seiko
Thickness
14.4 mm1
Lug width
20 mm120 mm watches
Weight
84 g1
Crystal
Box-shaped Hardlex1
Water resistance
5 bar (50 m)1
Movement
Seiko 4R571 · automaticSeiko 4R57 specs
Battery
none: the Seiko 4R57 is automatic
Years made
start not published
Case code
not in our data yet

On your wrist

No lug-to-lug or case length is published for the Seiko SSA343, so there is no fit verdict yet.

Actual size on your screen

Calibrate once with a bank card and the drawing shows the Seiko SSA343 at 1:1, next to a millimetre ruler.

1:1 · not calibrated: sizes are approximate
Seiko SSA343: size drawingSeiko SSA343, round case, top and side view to scale: case diameter 40.5 mm, lug to lug — (unknown), lug width 20 mm, thickness 14.4 mm. Bezel, dial and crown size are schematic.lug width 20Ø 40.5lug to lug —TOPthickness 14.4SIDE
Drawing from data, not a photo · mm
01020304050

Seiko SSA343 strap size

Lug width 20 mm1: a 20 mm strap with 20 mm spring bars fits between the lugs. 62 other models take 20 mm.

Attachment: not published in our sources.

Find your strap length in the watch strap size tool, with the Seiko SSA343 filled in.

On a bracelet? How to remove watch links to size it to your wrist.

20 mm strap: strap diagramTwo-piece strap laid flat (20 mm strap). Lug width 20 mm. Short piece — (unknown), long piece — (unknown). Buckle, keepers and holes are schematic.short —long —lug 20lug 20strap length —20 mm strap
20 mm at the lugs; lengths depend on your wristDrawing from data, not a photo · mm

Movement: Seiko 4R57

The Seiko SSA343 runs on the Seiko 4R57, an automatic movement. 2 other models in our base use it.

Beat rate
21,600 bph2
Power reserve
41 h2
Jewels
292
Hacking seconds
Yes2
Hand winding
Yes2

Battery

none: the Seiko 4R57 is automatic

A mechanical watch has no cell to replace; it needs a service instead.

Same size as the Seiko SSA343

Same movement: Seiko 4R57

Seiko SSA343 questions

Does the Seiko SSA343 need a battery?

No. The Seiko SSA343 has no cell to replace: a wound mainspring drives its automatic Seiko 4R57.

What movement is in the Seiko SSA343?

The Seiko SSA343 runs on the Seiko 4R57, an automatic movement.

What strap size does the Seiko SSA343 take?

The Seiko SSA343 measures 20 mm between the lugs, so it takes a 20 mm strap with 20 mm spring bars. 62 other models in our base share that width.

Find the strap length for your wrist and the Seiko SSA343 in the watch strap size tool.

More Seiko watches

Sources

Documents checked · Report a wrong number

  1. 1Seiko Watch Corporation — SSA343J1 product page (Presage), seikowatches.com global-en · html · read
  2. 2Seiko Watch Corporation — Instructions: SEIKO Automatic Watch Cal. 4R57 (English/multilingual booklet) · pdf · read