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Seiko watch · Cocktail Time · automatic

Seiko SRPB77

The Seiko SRPB77 measures 40.5 mm across and 12 mm thick, with 20 mm lugs.

Sources checked · How we source numbers
Case
40.5 mm1
Lug to lug
not found in our sources yet
Thickness
12 mm1
Lug width
20 mm1
Seiko SRPB77: size drawingSeiko SRPB77, round case, top and side view to scale: case diameter 40.5 mm, lug to lug — (unknown), lug width 20 mm, thickness 12 mm. Bezel, dial and crown size are schematic.lug width 20Ø 40.5lug to lug —TOPthickness 12SIDE
Seiko SRPB77, top and side, to scaleDrawing from data, not a photo · mm

Seiko SRPB77 specifications

Case diameter
40.5 mm1seller listing
Lug to lug
not found in our sources yet
Thickness
12 mm1seller listing
Lug width
20 mm1seller listing20 mm watches
Crystal
Mineral glass1seller listing
Water resistance
50 m1seller listing
Movement
Seiko 4R351seller listing · automaticSeiko 4R35 specs
Battery
none: the Seiko 4R35 is automatic
Years made
start not published
Case code
not in our data yet
Line
Cocktail Time1secondary source

On your wrist

No lug-to-lug or case length is published for the Seiko SRPB77, so there is no fit verdict yet.

Actual size on your screen

Calibrate once with a bank card and the drawing shows the Seiko SRPB77 at 1:1, next to a millimetre ruler.

1:1 · not calibrated: sizes are approximate
Seiko SRPB77: size drawingSeiko SRPB77, round case, top and side view to scale: case diameter 40.5 mm, lug to lug — (unknown), lug width 20 mm, thickness 12 mm. Bezel, dial and crown size are schematic.lug width 20Ø 40.5lug to lug —TOPthickness 12SIDE
Drawing from data, not a photo · mm
01020304050

Seiko SRPB77 strap size

Lug width 20 mm1seller listing: 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 SRPB77 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 4R35

The Seiko SRPB77 runs on the Seiko 4R35, an automatic movement. 25 other models in our base use it.

Beat rate
21,600 bph2
Power reserve
41 h2
2 sources disagree; show every value
  • manufacturer 41 h2
  • secondary source 40, 41 h4
Jewels
232
2 sources disagree; show every value
  • manufacturer 232
  • secondary source 23, 244
Accuracy
−35 to +45 s/day3
Hacking seconds
Yes2
Hand winding
Yes2

Battery

none: the Seiko 4R35 is automatic

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

Same size as the Seiko SRPB77

Same movement: Seiko 4R35

All 26 models on the Seiko 4R35

Seiko SRPB77 questions

Does the Seiko SRPB77 need a battery?

No. The Seiko SRPB77 has no cell to replace: a wound mainspring drives its automatic Seiko 4R35.

What movement is in the Seiko SRPB77?

The Seiko SRPB77 runs on the Seiko 4R35, an automatic movement.

What strap size does the Seiko SRPB77 take?

The Seiko SRPB77 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 SRPB77 in the watch strap size tool.

More Seiko watches

Sources

Documents checked · Report a wrong number

  1. 1Right Time International — SRPB77 listing, Right Time (Denver) - authorised dealer, retailer spec block · html · read
  2. 2Seiko Watch Corporation — Instructions: Seiko Automatic Diver's Watch Cal. 4R15/4R16/4R35/4R36/7S26/7S35/7S36 (English) · pdf · read
  3. 3Seiko Watch Corporation — Instructions: Diver's Watch for Air Diving, Cal. 4R35 / 4R36 (English) · pdf · read
  4. 4Grail Watch — Grail Watch Reference: Seiko Cal. 4R35 · html · read
  5. 5Seiko Watch Corporation — Instructions: Mechanical watch, Cal. 4R35 / 4R36 / 4R37 / 4R38 / 4R71 / 4R72 / 4R39 (English) · pdf · read