Grand Seiko · Heritage Collection
Grand Seiko SBGA413: specifications and what to check
The same Spring Drive calibre as the SBGA211 in a different case: 40mm rather than 41, thicker, on a box crystal instead of a dual-curved one. Identical movement, different watch.
Reference SBGA413 · specifications read from the manufacturer on 2026-09-22 · listed as current
Specifications
As published by Grand Seiko. A field the manufacturer does not state is left out rather than filled in.
- Case
- High-Intensity Titanium, 40.0 mm, described as a reborn 62GS design
- Diameter
- 40 mm
- Thickness
- 12.8 mm
- Lug width
- 21 mm
- Lug to lug
- 47 mm
- Water resistance
- 10 bar
- Crystal
- Box shaped sapphire crystal, anti-reflective coating on inner surface
- Dial
- Described as inspired by Hana-Ikada, spring cherry blossoms floating on a river
- Case back
- See-through and screw case back
- Crown
- Screw-down
- Bracelet
- 21 mm band width, 202 mm band perimeter
- Clasp
- Folding clasp with push button release
Movement
- Calibre
- 9R65
- Type
- Spring Drive, self-winding with manual-winding
- Power reserve
- Approximately 72 hours (3 days)
- Jewels
- 30
- Notes
- Stated accuracy ±15 seconds per month (±1 second per day). Power reserve indicator. Listed as allergy-safe metal. Total weight 102 g.
What to check before you buy
- Check the reference number against the case dimensions before you list it. Two titanium Spring Drive watches in this collection share the 9R65 and differ by a millimetre of diameter, so the movement tells you nothing about which one you have.
- Inspect the box crystal's raised edge under raking light for flakes. A squared sapphire profile on a titanium case gives the glass no protection from a knock the case would otherwise take.
- Confirm the band perimeter suits the buyer. Grand Seiko states 202 mm here, which is generous, and a bracelet sized for a large wrist may need links the seller no longer has.
- Ask whether the removed bracelet links are included and photograph them. Titanium links cannot be replaced from a steel parts drawer and a short bracelet is a real deduction.
- Wind it fully and read the power reserve indicator a day later, as with any Spring Drive. The stated 72 hours is a claim the dial itself lets you audit.
Same calibre, different watch
This is the trap on this reference and it is worth stating before anything else.
The 9R65 inside is the identical movement to the one in the SBGA211: Spring Drive, self-winding with manual winding, approximately 72 hours, ±15 seconds per month, 30 jewels, power reserve indicator, High-Intensity Titanium case.
Everything a seller is likely to mention in a listing is therefore common to both. What differs is the case.
Where they part company, this reference first:
- Diameter — 40.0 mm, against 41.0 mm
- Thickness — 12.8 mm, against 12.5 mm
- Lug to lug — 47.0 mm, against 49.0 mm
- Lug width — 21 mm, against 20 mm
- Crystal — box shaped sapphire, against dual-curved sapphire
- Weight — 102 g, against 100 g
Read that list before you write a description. A photograph of a titanium Grand Seiko with a reserve indicator at eight o'clock does not tell you which of these you are looking at, and quoting the wrong lug width to a buyer who wants to fit a strap is an avoidable error.
Grand Seiko describes this case as the 62GS design reborn.
Box crystal on a case that offers it no help
The glass is box shaped sapphire with the coating on the inner surface — a squared profile standing above the case rather than a dome following it.
On this reference that shape sits on a titanium case, and titanium is softer than steel at the surface. Neither material protects the glass; the glass is the highest point and meets obstacles first.
So inspect the crystal's vertical edge all the way round, with light raking across it at a low angle. Sapphire does not wear gradually — it stays perfect and then chips — and a flake at the turn-down is nearly invisible from directly above.
Two hundred and two millimetres of bracelet
The published band perimeter is 202 mm, the most generous in this brand's pages here. That is a bracelet sized for a large wrist.
Which raises the question every used bracelet raises, and which matters more in titanium: where are the removed links?
A bracelet resized down for a previous owner has links somewhere, and those links are High-Intensity Titanium. They cannot be substituted from a steel parts drawer, they are not generic, and a buyer with a larger wrist than the last owner simply cannot wear the watch without them.
Ask. Photograph whatever comes with it. If the links are missing, that is a deduction you should take at the buy, not a surprise you absorb at the sale.
Auditing the reserve
As on every Spring Drive, the dial carries a power reserve indicator, and that turns the specification into a test rather than a claim.
Wind to full. Mark where the hand sits. Leave the watch alone for twenty-four hours and look again — roughly a third of the range should have gone. A markedly faster fall points at the barrel, and you will have found it before the buyer does.
Total weight is 102 grams, which is what forty millimetres of titanium feels like: light enough to be immediately noticeable in the hand.
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Sources
Not affiliated with Grand Seiko. Specifications are read from the manufacturer's own published documentation on the date shown and may change; the manufacturer's current documentation governs.