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Seiko watch · automatic

Seiko Marinemaster 1968 Heritage Diver's Watch

The Seiko SLA077J1 measures 42.6 mm across, 49.3 mm lug to lug, and 13.4 mm thick, with 20 mm lugs. It fits wrists from ~17.5 cm (flat-fit estimate).

Sources checked · How we source numbers
Case
42.6 mm1
Lug to lug
49.3 mm1
Thickness
13.4 mm1
Lug width
20 mm1
Seiko SLA077J1: size drawingSeiko SLA077J1, round case, top and side view to scale: case diameter 42.6 mm, lug to lug 49.3 mm, lug width 20 mm, thickness 13.4 mm. Bezel, dial and crown size are schematic.lug width 20Ø 42.6lug to lug 49.3TOPthickness 13.4SIDE
Seiko SLA077J1, top and side, to scaleDrawing from data, not a photo · mm

Seiko SLA077J1 specifications

Case diameter
42.6 mm1
Lug to lug
49.3 mm1
Thickness
13.4 mm1
Lug width
20 mm120 mm watches
Weight
196 g1
Crystal
Dual-curved sapphire crystal1
Water resistance
300m / 1000ft diver's1
Movement
Seiko 8L351 · automaticSeiko 8L35 specs
Battery
none: the Seiko 8L35 is automatic
Years made
start not published
Case code
not in our data yet

On your wrist

The verdict compares the lug to lug with the flat top of your wrist. Balanced from ~17.5 cm, past the edges below ~15.5 cm.

= 6.7 in

At the edge on a 17 cm wrist: the 49.3 mm lug to lug covers 90% of an estimated 54.8 mm flat top.

Flat top = circumference ÷ 3.1, a community convention, not a measurement of your arm. Compact ≤ 0.75 of the flat top, balanced ≤ 0.89, at the edge ≤ 1. Compare more watches in the watch size calculator.

Seiko SLA077J1: wrist fitSeiko SLA077J1 on a wrist, top view to scale. lug to lug 49.3 mm. Wrist 170 mm, estimated flat width 54.8 mm (circumference / 3.1). Ratio 0.90: at the edge.wrist, flat topwrist flat ≈ 54.8lug to lug 49.3At the edge · 49.3 / 54.8 = 0.90estimate: wrist 170 / 3.1 = 54.8 flatcompactbalancededgeoverhang0.750.891
Seiko SLA077J1 on a 17 cm wristDrawing from data, not a photo · mm

Actual size on your screen

Calibrate once with a bank card and the drawing shows the Seiko SLA077J1 at 1:1, next to a millimetre ruler.

1:1 · not calibrated: sizes are approximate
Seiko SLA077J1: size drawingSeiko SLA077J1, round case, top and side view to scale: case diameter 42.6 mm, lug to lug 49.3 mm, lug width 20 mm, thickness 13.4 mm. Bezel, dial and crown size are schematic.lug width 20Ø 42.6lug to lug 49.3TOPthickness 13.4SIDE
Drawing from data, not a photo · mm
01020304050

Seiko SLA077J1 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 SLA077J1 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 8L35

The Seiko SLA077J1 runs on the Seiko 8L35, an automatic movement. 2 other models in our base use it.

Beat rate
28,800 bph2
Power reserve
50 h2
Jewels
262
Accuracy
−10 to +15 s/day2
Hacking seconds
Yes2
Hand winding
Yes2

Battery

none: the Seiko 8L35 is automatic

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

Same size as the Seiko SLA077J1

The models nearest to the Seiko SLA077J1 in case width and lug to lug, drawn over it to scale; below, every model within 1 mm of its 49.3 mm.

Size comparison: Seiko SLA077J1, Dan Henry 1963 GMT Automatic, Spinnaker SP-5121-AA, Seiko SRPE33Top-view outlines to scale on one centre. A Seiko SLA077J1: Ø 42.6, L2L 49.3, lug 20, T 13.4. B Dan Henry 1963 GMT Automatic: Ø 42.5, L2L 50, lug 22, T 13.9 (vs A: Ø −0.1 L2L +0.7 lug +2 T +0.5). C Spinnaker SP-5121-AA: Ø 42, L2L 50, lug —, T 15 (vs A: Ø −0.6 L2L +0.7 T +1.6). D Seiko SRPE33: Ø 43.8, L2L 48.7, lug 22, T 12.8 (vs A: Ø +1.2 L2L −0.6 lug +2 T −0.6).C Ø 42B Ø 42.5A Ø 42.6D Ø 43.8D L2L 48.7A L2L 49.3B L2L 50C L2L 50A Seiko SLA077J1Ø 42.6 · L2L 49.3 · lug 20 · T 13.4B Dan Henry 1963 GMT AutomaticØ 42.5 · L2L 50 · lug 22 · T 13.9vs A: Ø −0.1 L2L +0.7 lug +2 T +0.5C Spinnaker SP-5121-AAØ 42 · L2L 50 · lug — · T 15vs A: Ø −0.6 L2L +0.7 T +1.6D Seiko SRPE33Ø 43.8 · L2L 48.7 · lug 22 · T 12.8vs A: Ø +1.2 L2L −0.6 lug +2 T −0.6
A Seiko SLA077J1 and the 3 nearest in size, on one centre, to scaleDrawing from data, not a photo · mm

Nearest in size

  1. ASeiko SLA077J1this watch
  2. BDan Henry 1963 GMT AutomaticW −0.1 · L2L +0.7 · T +0.5 mm
  3. CSpinnaker SP-5121-AAW −0.6 · L2L +0.7 · T +1.6 mm
  4. DSeiko SRPE33W +1.2 · L2L −0.6 · T −0.6 mm

Differences against A in mm: W case width, L2L lug to lug, T thickness. Nearest by width and length together, from the published sizes.

Same published case dimensions (1)Seiko SLA079J1

Same movement: Seiko 8L35

Seiko SLA077J1 questions

How big is the Seiko SLA077J1?

The Seiko SLA077J1 measures 42.6 mm across, 49.3 mm lug to lug, 13.4 mm thick, 196 g.

Will the Seiko SLA077J1 fit a 7-inch wrist?

Balanced: the Seiko SLA077J1's 49.3 mm lug to lug takes 86% of the ~57.4 mm flat top of a 7-inch (17.8 cm) wrist. By the same estimate (circumference ÷ 3.1) it sits balanced from about 17.5 cm and overhangs the flat top on wrists under about 15.5 cm.

Does the Seiko SLA077J1 need a battery?

No. The Seiko SLA077J1 has no cell to replace: a wound mainspring drives its automatic Seiko 8L35.

What movement is in the Seiko SLA077J1?

The Seiko SLA077J1 runs on the Seiko 8L35, an automatic movement.

What strap size does the Seiko SLA077J1 take?

The Seiko SLA077J1 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 SLA077J1 in the watch strap size tool.

More Seiko watches

Sources

Documents checked · Report a wrong number

  1. 1Seiko Watch Corporation — SLA077J1 | Seiko Watch Corporation · html · read
  2. 2Seiko Watch Corporation — Mechanical watch instructions, Cal. 8L35 (EN) · pdf · read
  3. 3CaliberCorner — Seiko Caliber 8L35 watch movement page · html · read
  4. 4Grail Watch — Grail Watch Reference: Seiko 8L35 · html · read