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Seiko · Prospex

Seiko Prospex Land SPB503

Reference SPB503J1 · Tool · 39.5 mm

Specifications

Reference
SPB503J1
Family
Prospex
Category
Tool
Status
Current
Case material
Stainless steel
Case diameter
39.5 mm
Case thickness
12.7 mm Official
Lug-to-lug
46.4 mm Official
Lug width
20 mm Official
Water resistance
200 m
Bezel
—
Calibre
6R55 Official
Power reserve
about 72 h

Official product page · retrieved October 14, 2026

Does it fit your wrist?

Enter your wrist circumference. The watch appears to scale on the flat top of the wrist.

Lug-to-lug 46.4 mmFlat top of the wrist 54.1 mm
Top view on a wrist, to scale
Flat top of the wrist 54.1 mmLug-to-lug 46.4 mmCase diameter 39.5 mm
Side view, across the wrist

Comfortable

Lug-to-lug 46.4 mm on a flat top of 54.1 mm: 86 % of the width.

Lug-to-lug is 75 to 95% of the flat top, the usual comfortable range.

Measurements and sources

Brands rarely publish thickness, lug width and lug-to-lug together. Each observation below is kept separate, with who gave it.

Case thickness

Value Type Source Date
12.7 mm Official Seiko October 14, 2026

Lug-to-lug

Value Type Source Date
46.4 mm Official Seiko October 14, 2026

Lug width

Lug width is the gap between the lugs, where the strap fits. It is not lug-to-lug.

Value Type Source Date
20 mm Official Seiko October 14, 2026

Calibre source

Official Seiko · retrieved October 14, 2026

Other versions in the same case

These references differ only by dial, bracelet or bezel colour. The brand gives them the same case dimensions, so the figures on this page apply to them too.

Other Prospex references

Watch Ø Thickness Lug-to-lug Calibre
Prospex Marinemaster 1965 Heritage Diver's SJE099J1 39.5 mm 12.3 mm 47.2 mm 6L37
Prospex Marinemaster 1968 Heritage Diver's SLA077 SLA077J1 42.6 mm 13.4 mm 49.3 mm 8L35
Prospex Sea SPB077 1968 Diver's Modern Re-interpretation SPB077J1 44 mm 12.7 mm 51 mm 6R15
Prospex Sea SPB101 SPB101J1 45 mm 12.9 mm 52.6 mm 6R35
Prospex Sea SPB145 1965 Heritage Diver's SPB145J1 40.5 mm 13.2 mm 47.6 mm 6R35
Prospex Sea SPB153 1970 Heritage Diver's SPB153J1 42.7 mm 13.2 mm 46.6 mm 6R35
Prospex Land SPB155 SPB155J1 38 mm 12.9 mm 46 mm 6R35
Prospex Sea SPB189 Titanium SPB189J1 43.5 mm 13.3 mm 51 mm 6R35
Prospex Land SPB209 SPB209J1 39.5 mm 13.2 mm 46.4 mm 6R35
Prospex Land SPB241 SPB241J1 38 mm 12.9 mm 46.2 mm 6R35
Prospex Sea SPB317 SPB317J1 41 mm 12.3 mm 46.9 mm 6R35
Prospex Land SPB377 Mechanical GMT SPB377J1 39.5 mm 13.6 mm 46.4 mm 6R54
Prospex SPB453 1965 Heritage Diver's SPB453J1 40 mm 13 mm 46.4 mm 6R55
Prospex Sea SPB481 SPB481J1 41.3 mm 12.5 mm 48.2 mm 6R55
Prospex Speedtimer SPB513 Mechanical SPB513J1 39.5 mm 12 mm 44.5 mm 6R55
Prospex Sea SPB519 1968 Heritage Diver's GMT SPB519J1 42 mm 13.3 mm 48.6 mm 6R54
Prospex Speedtimer SRQ047 Mechanical Chronograph SRQ047J1 42 mm 14.6 mm 49.5 mm 8R48

Same brand in the data set

Watch Ø Thickness Lug-to-lug Calibre
Presage Sharp Edged Series SPB165 SPB165J1 39.3 mm 11.1 mm 47.2 mm 6R35
Presage Classic Series SPB463 SPB463J1 40.2 mm 13 mm 46 mm 6R55
Presage Cocktail Time SRPB41 SRPB41J1 40.5 mm 11.8 mm — 4R35
Presage Style60's GMT SSK013 SSK013J1 40.8 mm 13 mm 47 mm 4R34
Seiko 5 Sports SKX GMT SSK001 SSK001 42.5 mm 13.6 mm 46 mm 4R34
Seiko 5 Sports Field GMT SSK023 SSK023 39.4 mm 13.6 mm 47.9 mm 4R34

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