Skip to content
Seiko Astron

Seiko Astron

SolarSteel

Ref. SBXC051

Collection: AstronCase size: 42.7mmMovement: 5X53

The Seiko Astron, reference SBXC051, is a GMT watch with a 42.7 mm steel case. This is a special edition; the watch has world time, a perpetual calendar and a power reserve indicator. The case is 13.3 mm thick, with a lug-to-lug measurement of 49.9 mm and a water-resistance rating of 100 metres. Solar-powered calibre 5X53 contains 12 jewels and operates for approximately 6 months when fully charged. The dial has a day display. The clasp has a three-fold construction with push-button release. The dial has LumiBrite on the hands and indices. The dial is covered by a dual-curved sapphire crystal with a Super Clear coating.

Add to my inventory

Free account required - pre-fills all specs automatically

Last updated 9 Oct 2026Suggest a correction

TECHNICAL SPECIFICATIONS

CASE

Diameter

42.7mm

Thickness

13.3mm

Lug to Lug

49.9mm

Case Material

Steel

Water Resistance

100m

Crystal

Sapphire Crystal

MOVEMENT

Movement Type

Solar

Caliber

5X53

Jewels

12 jewels

BRACELET/STRAP

Clasp Type

Fold Clasp

FEATURES & COMPLICATIONS

GMTLuminous handsLuminous indicesPerpetual calendarPower Reserve DisplaySolar watchSpecial EditionWeekdayWorld time watch

More from Seiko

Show all →

Other watches with the 5X53 calibre

Show all →

FOR WATCH DEALERS

Trading the Seiko Astron?

Clone any catalog watch into your stock, sync it to Chrono24 and eBay, and invoice it with your own tax settings.