Description

Up for sale is the Seiko Brightz SDGM003, a Japan Domestic Market model and one of the most sought-after JDM Seiko dress watches of its era. Known among collectors as the "Grand Cocktail", it delivers a level of finishing that punches far above its price point.

The dial is the star. A deep black sunburst that shifts from charcoal to jet black depending on the light, with faceted applied indices and slim dauphine hands. Paired with a 40.5mm stainless steel case with alternating brushed and mirror-polished surfaces, protected by Seiko's scratch-resistant Dia-Shield coating. It wears slim at 11.5mm and dresses up or down with ease.

The watch was serviced in November 2023, and the movement is currently running within COSC parameters.

YouTube review:
https://youtu.be/lkSj_sd9uJg?si=uRVWefDfHBWHp-ZE

Specifications:
- Stainless steel case and bracelet with “Diashield” coating
- Dimensions: 40.5mm diameter; 11.5mm thickness and lug width of 20mm
- Crystal: sapphire with super clear coating
- Automatic caliber 6R15 - 21,600 BPH, power reserve of 50 hours
- Water Resistance: 10 Bar / 100m

- Wrist circumference: up to 21cm

- Condition: V (Very good) - See full details below

High resolution photos:
https://imgur.com/a/ZM2WXnU

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Hi there! I’m a long-time watch enthusiast and collector with over 20 years of experience in the hobby. I’m mainly into Japanese watches: Grand Seiko, high-end Seiko, Casio Oceanus — basically anything that offers great value and proper watchmaking without the silly price tags. I like watches that punch above their weight, and that’s exactly the type I tend to buy, wear, and sell.

Every watch I sell is carefully inspected and photographed by me. I take pride in showing the watch honestly — no hidden marks, no stock photos, no surprises. What you see in the pictures is exactly what you’ll receive.

I’m based in Lixnaw, Co. Kerry and have built a solid track record here on Adverts.ie for being straightforward, reliable, and easy to deal with. I don’t entertain lowballing, as my prices are already fair. Lowballers and other 'exotic offer' experts, please ignore this sale.
And just to be fully clear: I’m not looking for swaps or part exchanges. I prefer straight cash sales only.

All my watches are graded using my standardised condition scale:

N (New) — unworn condition. Typically includes full set (box, papers, tags).

S (Like New) — almost indistinguishable from new. No visible scratches or marks. Crystal and case flawless.

A (Excellent) — Lightly worn with minimal signs of use. Minor hairline scratches visible only on close inspection.

V (Very good) — Gently used with only minor signs of use; the crystal may carry minor traces consistent with normal wear, but they do not stand out. Overall condition remains clean and attractive.

B (Good) — Regularly worn with moderate signs of use. Noticeable scratches on case or bracelet; crystal may have faint marks but remains in good condition.

C (Fair) — Clearly worn with pronounced scratches, dings, or crystal marks. Functional but cosmetic wear is obvious; may benefit from servicing.

Cheers!
Jake