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4.6 / 512 customer reviews for this watch

Tona Mod | Black Rubber - Gold Diamond - 40 mm

40 mm · VK63 Meca-Quartz · Sapphire Crystal · 316L Stainless Steel

€259.00

incl. VAT, free shipping

You can also pay in 3 instalments with Klarna

Dial

Hand-assembled · Delivery 10–12 days after ordering

Quality takes time.

  1. Ordered
  2. Built
  3. Checked
  4. Shipped

Description

TONA MOD – Chronograph Style Watch 

This custom mod watch is assembled with aftermarket components.

The TONA MOD is a custom-built chronograph-style watch designed for bold aesthetics and everyday reliability. 
Powered by the genuine Seiko VK63 Meca-Quartz movement, it delivers precise quartz timekeeping with a crisp, functional chronograph feel in a clean, sporty design.

The case in durable 316L stainless steel and the rubber strap provide excellent corrosion resistance, long-term durability, and a refined finish. A sapphire crystal ensures strong scratch resistance and clear legibility, making the TONA MOD a reliable daily-wear watch with a classic chronograph look.

Key Features

  • Genuine Seiko VK63 Meca-Quartz chronograph movement
  • Fully functional chronograph (VK63 version)
  • 316L stainless steel case and rubber strap
  • Sapphire crystal, scratch-resistant
  • Adjustable rubber strap
  • Free bracelet adjusting tool included for easy at-home sizing

Specifications

  • Case diameter: 40 mm (excluding crown)
  • Thickness: approx. 12 mm
  • Movement: Seiko VK63 Meca-Quartz
  • Crystal: Sapphire (anti-scratch)
  • Strap: rubber, adjustable (approx. 14.5 cm – 22 cm)
  • Water resistance: 5 ATM

Components & Materials

  • Case: 316L Stainless Steel
  • Strap: Rubber
  • Crystal: Sapphire
  • Movement: Seiko VK63 Meca-Quartz

Build, QC & Shipping

Each watch is assembled, checked, and quality-controlled before shipping to ensure proper function and finish.
We offer free, tracked and secured international shipping. Within the EU, taxes are included and no customs duties apply; for deliveries outside the EU, import charges of the destination country may apply.

A free bracelet adjusting tool is included to allow quick and easy sizing at home.

Ordering and delivery

  • Every watch comes with a 2-year warranty from delivery. It covers manufacturing defects and functional problems under normal use. It doesn't cover scratches, damage from opening the watch, or water damage.
  • 10–12 days after ordering
  • 14-day withdrawal period. The period starts on receipt. For deliveries to the UK, US and Australia, we offer 14-day returns.

Specifications

Movement
VK63 Meca-Quartz
Case
40 mm
Crystal
Sapphire Crystal
Water resistance
5 ATM
Movement
VK63 Meca-Quartz
Case
40 mm
Crystal
Sapphire CrystalFar more scratch-resistant than mineral glass.
Material
316L Stainless Steel
Water resistance
5 ATMHand washing, rain, a short swim: yes. Diving, hot showers, sauna: no.
Case back
Transparent CasebackShows the movement at work.

Shipping & delivery

  • Standard shipping is free, whatever the order value.
  • Every piece is built to order. Delivery worldwide takes an estimated 10–12 calendar days from order.
  • Priority Build is an optional extra for €9.99, chosen on the product page: your order is prioritized in production.
  • Within the EU, no import duties and no import VAT apply.
  • Outside the EU (e.g. Norway, Switzerland, the United Kingdom, the USA), import duties, import VAT and customs clearance fees may be levied in the country of destination. They are not included in the price and are borne by the buyer.
  • Once your order has shipped, you’ll receive the tracking number by email.

Shipping and delivery times

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Returns & warranty

  • Our refund policy explains the 14-day right of withdrawal and our additional 14-day return offer from receipt for deliveries to the UK, USA and Australia.
  • You bear the direct cost of returning the goods.
  • The statutory warranty rules apply.

Returns and cancellation · Terms

FAQ

What is a Seiko mod?

A Seiko mod is a modified watch that uses an authentic Seiko movement, combined with third-party high-quality parts. Most of our watches come in stainless steel with sapphire crystal.

How long will it take to receive my watch?

It usually takes 10–12 days from order to delivery. The reason: we build every watch by hand only after you order it. It then goes through quality control, and only after that do we ship it. With Priority Build (an optional extra for €9.99, chosen on the product page) your watch moves to the front of the bench.

Can I customize the logo or remove it?

Absolutely. Send us an email with your order number and full name after ordering, stating your desired design or that you want to remove the logo. You can also leave a note at checkout, or contact us before ordering.

Do you offer a warranty?

Yes. Every watch comes with a 2-year warranty from delivery. It covers manufacturing defects and functional problems under normal use. It doesn't cover scratches, damage from opening the watch, or water damage. If your watch is rated 5 ATM, hand-washing and rain are fine. Avoid diving, hot water and showering.

Is MedoMods a legitimate shop?

MedoMods is run by AM GbR, based in Leimen near Heidelberg, Germany. Our address and VAT ID are in the legal notice. You pay through Stripe, for example by card, PayPal or Klarna, and your card details never reach us. For deliveries to the UK, USA and Australia, we offer 14-day returns from delivery. We do not charge an additional restocking fee. We issue refunds within 4 calendar days after receiving the return. Every watch comes with a 2-year warranty. You can find our seller ratings on eBay.

Why are your watches cheaper than those in other shops?

We push prices down as much as we can. We believe many comparable watches are overpriced because shops bundle extras (like extra straps) into the price. We let you choose what you want, so you only pay for what you actually need.

Do you use genuine Seiko movements?

Yes. We source from suppliers who sell authentic Seiko movements. The specific movement is listed on each model’s product page. If you suspect that your watch contains the wrong movement or a non-genuine one, contact us with your order number and a description.

Are the watches hand-built?

Yes — all our watches are built by hand.

Find answers about ordering, care and service in our FAQ.

Manufacturer & product safety

Manufacturer
AM GbR, trading as “MedoMods”, Danziger Straße 6, 69181 Leimen, Germany
info@medomods.com
Product
Tona Mod | Black Rubber - Gold Diamond - 40 mm

What our customers say

MedoMods · 4.6 / 5 · 12 customer reviews

  • Customer review

    MedoMods · 4.0 / 5 · 1 Customer review

    „What makes this version stand out for me: the sporty chronograph layout, the black colour and the gold-coloured finish. It feels comfortable and easy to wear.“

    Mia Reed

    USA

  • Customer review

    MedoMods · 5.0 / 5 · 1 Customer review

    „Für meine Wahl war die Gestaltung ausschlaggebend: die funkelnden Akzente, das Kautschukarmband, die schwarze Farbgebung und das sportliche Chronographen-Layout. In echt wirkt das Design hochwertig und ausgewogen.“

    Noah Baumann

    Switzerland

  • Customer review

    MedoMods · 5.0 / 5 · 1 Customer review

    „Ich habe erst genau hingesehen, bevor ich sie behalten habe. Hier zeigt sich die Liebe zum Detail: das sportliche Chronographen-Layout, die funkelnden Akzente, das Kautschukarmband und die schwarze Farbgebung.“

    Lukas Schwarz

    Austria

A hand working on an open watch movement with tweezers

The craft behind it

Assembled by hand.Inspected in Germany.

Every watch is assembled individually, regulated and inspected before it ships.

A look inside the workshop

More on this topic

2-Year Warranty
14-Day Returns
Ships from Germany
Secure Checkout