Grand Seiko SBGX353: specifications and what to check

A quartz watch that is not the cheap option

The word quartz does a lot of damage in a listing, so deal with it directly.

Grand Seiko states this movement, the 9F61, at ±10 seconds per year. Not per month. Per year. The mechanical references documented elsewhere on this site are specified in seconds per day, and the best of them are allowed several seconds of drift in twenty-four hours.

That is the entire argument for the reference, and it is a factual one rather than a matter of taste. A buyer who dismisses quartz on reflex is dismissing an accuracy figure roughly three orders of magnitude tighter than the mechanical watch they were considering instead.

Put the number in the listing. Do not write "quartz movement" and hope.

Splash resistant means splash resistant

This is the specification most likely to cost you money after the sale, so read it exactly as Grand Seiko wrote it.

The water resistance is given as Splash Resistant. There is no bar figure and no metre figure, because there is no rating of that kind to give.

Practically: rain is fine, washing your hands is fine, and everything else is not. No swimming, no showering, no washing up. That is a genuine constraint on a dress watch and it belongs in your description in plain words, because a buyer who assumes "it's a modern steel watch, it'll be fine" will find out the expensive way and will blame you.

Small, light, and honest about it

Published dimensions: 34.0 mm across, 10.7 mm thick, 41.5 mm lug to lug, 18 mm between the lugs, and the complete watch weighs 47 grams.

Forty-seven grams is barely there. Thirty-four millimetres is small by current taste, and forty-one and a half lug to lug will disappear on a large wrist.

None of that is a defect — it is a dress watch built to dress-watch proportions — but it is exactly the kind of thing a buyer should learn from your listing rather than from the parcel. Quote all four dimensions. They are published, they cost you nothing, and a buyer who knows what is coming does not return it.

Where to look on the watch itself

Two things reward attention.

The indexes. Grand Seiko describes them as five-faceted and diamond-cut, with a distinct marker at twelve so the orientation reads at any angle. Under a loupe every facet should be crisp and every index should catch light the same way as its neighbours.

The seconds hand's landing. On a watch sold on precision, the hand should strike each index squarely rather than stopping a hair short or long. It is a quick, telling check, and it is the sort of detail this calibre family exists to get right.

The crystal is box shaped sapphire with coating on the inner surface, which on a case this small means a raised glass with nothing around it to take a knock first. Look along its edge for chips.