lug2lug
BrowseCompareNewsCommunityMy Watches
BrowseCompareNewsCommunityMy Watches
Theme
Popular microbrands:Christopher Ward·Baltic·anOrdain·Atelier Wen·Boldr·Bremont·Dan Henry·DOXABrowse all →
Best, by the specs:Diver under $2,000·Dress under $5,000·Chronograph under $5,000·Best sport watches·GMT under $5,000·Field under $500·Pilot under $2,000·Casual under $1,000All rankings →
Glossary:Lug-to-Lug·Water Resistance·Chronograph·GMT·Automatic·LumeBrowse all →
Tools:Collection tracker·Watch size chart·Wrist-fit calculator·Selling calculator·What should I buy?·Market index·iPhone app
Lug2Letter
Watches worth knowing about, weekly.
Curated discoveries, founder spotlights, and the occasional deep-dive.
Get the app
Download on theApp StoreGET IT ONGoogle Play
TermsPrivacyDelete accountCopyrightDisclosuresContactContribute

Independent reference site · not affiliated with any brand · contains affiliate links

© 2026 Lug2Lug LLC · Prices are estimates and not offers

Loading watch
Home/Browse/Addiesdive/Tuna 300M Diver
SpecStudio
Addiesdive Tuna 300M Diver
Click to inspect
Addiesdive · MM 300

Addiesdive Tuna 300M Diver

Diver

$139In stock
Buy from AddiesdiveFind used on eBay

lug2lug doesn't sell watches. Buy links open the brand's or seller's own site. Some links here are affiliate links. lug2lug may earn a commission at no extra cost to you. Disclosures

Case

Diameter
41mm
Thickness
15mm
Lug-to-lug
44.5mm
Lug width
22mm
Material
Stainless Steel
Water resistance
300m

Crystal & dial

Crystal
Sapphire

Movement

Caliber
Seiko NH35
Type
Automatic

Seiko

Seiko's third-party supply version of the 4R35, sold to external watch brands and modders worldwide. Adds hacking and hand-winding over the 7S26 it effectively replaced. The NH35 has become the default automatic movement for watch modding and microbrand watches, thanks to its low cost, reliability, and wide availability of compatible parts including dials, hands, and cases in the Seiko-compatible format.

MM 300 collection · 5 watches

Emperor Tuna 300m Diver
Emperor Tuna 300m Diver47.5mm
Marinemaster 300
Marinemaster 30044mm
Tuna 300M Diver Tuna Diver 3Colors
Tuna 300M Diver Tuna Diver 3Colors47.5mm
Tuna Diver
Tuna Diver41mm
Alternatives

Market

Retail$139

No forum listings recorded for this watch yet.

Similar watches

Audaz ADZ-3050

Audaz

ADZ-3050

42mm · Automatic$550

Audaz Sea Ranger ADZ-2050

Audaz

Sea Ranger ADZ-2050

42mm · Automatic$375

Duxot Henri Diver Automatic

Duxot

Henri Diver Automatic

41mm · Automatic$310

Spinnaker Hull Diver

Spinnaker

Hull Diver

42mm · Automatic$375

Aquatico Aequorea Victoria Tritium Black Dial

Aquatico

Aequorea Victoria Tritium Black Dial

42mm · Automatic$599

Aigi Watches Arctic Diver Black Diver

Aigi Watches

Arctic Diver Black Diver

41mm · Automatic$480

View all alternatives

Community

“

Owners widely praise the Addiesdive Tuna 300M Automatic Dive Watch AD2509 for its excellent value, with many finding the case finishing comparable to higher-priced brands and appreciating the sapphire crystal and strong lume. The Seiko NH35 movement is generally considered reliable and keeps good time, with some owners reporting accuracy within +1/+2 seconds per day, while others note figures around -6 seconds per day. The watch is seen as a competent homage, featuring a ceramic bezel insert and solid link bracelet. One owner noted the 39mm case size as easy to wear on a 7-inch wrist. However, some owners express skepticism regarding the actual water resistance beyond casual use, despite the 300m rating, and question the warranty's reliability. The bracelet is frequently described as significantly worse than that found on comparable brands, though still visually appealing. Quality control variance is a concern for some, with instances of misaligned bezel inserts reported.

Synthesized from 8 sources
WatchUSeek·4↗
Reddit·2↗
WatchCrunch·2↗
Open the discussion

On real wrists

No shots yet. Show how it wears.

Related

Ask the communityStart a discussion about the Tuna 300M Diver: get takes from other collectors.Ask →

Discussion