You have just ordered a watch from Time2Seiko, or you are seriously considering it. And the question always comes at the same moment: does it resist water? In the morning shower? At the pool this summer? It is a fair question for a watch costing 200-400 euros. Here is an honest answer, without overselling.
Direct answer: A waterproof Seiko mod assembled by Time2Seiko handles everyday water very well: rain, hand washing, splashes. Our recommendation remains to remove the watch for showering and swimming. Not because it cannot cope, but because water resistance depends on one simple habit people sometimes forget: screwing the crown down properly.
A Seiko mod is not a modified Seiko: understanding what you receive
This is the point many people do not know, and it changes everything about perceived quality. At Time2Seiko, we do not start from an existing Seiko watch that we take apart and rework. We assemble each watch piece by piece, to order, based on an authentic movement (NH35 or NH36 calibre depending on the model), with the components chosen by the customer: case, dial, hands, sapphire crystal, strap.
It is closer to artisanal fine watchmaking than to tuning. Every part is selected, adjusted and fitted by hand in our workshop in France. Nothing is salvaged from a used watch. Nothing is rushed to save time.
Why does this matter for water resistance? Because when you assemble a watch from scratch, you control every step:
- The O-ring gaskets are new, never compressed or reused
- The crystal gasket (the seal between the sapphire crystal and the case) is greased with the exact amount of waterproof silicone grease before fitting
- The crown gasket is selected at the right diameter for the chosen case
- The case back is closed at the appropriate torque
Across more than 500 watches delivered to date, we have had no returns, no complaints related to water resistance. Not a single one. That is the result of careful assembly, not a marketing promise, and it is what our 50 customer reviews published on the site, with an average rating of 5 out of 5 stars, reflect.
What determines water resistance: ATM ratings clearly explained
ATM stands for atmosphere, the pressure unit used to measure a watch's water resistance. One ATM corresponds to the pressure of a 10-metre water column in static laboratory conditions. In practice, an arm moving through water generates far higher dynamic pressure. ATM figures should therefore not be taken literally.
| Rating | Approved usage context | Concrete examples |
|---|---|---|
| 3 ATM / 30 m | Light splashes | Rain, hand washing, splashes |
| 5 ATM / 50 m | Contact with water | Gentle swimming, shower (crown screwed down) |
| 10 ATM / 100 m | Active swimming, snorkelling | Pool, sea, water sports |
| 20 ATM / 200 m | Scuba diving | Technical diving |
Our watches generally reach 3 to 5 ATM once assembled. That level is comfortable for everyday use. But there is one condition we repeat to every customer: the crown must be fully screwed down before any contact with water.
The crown: the only real point of attention
The crown is the small knob on the side of the case used to set the time. It is also the main entry point for water on any watch, Seiko mod or not. When it is properly screwed down against the case, the gasket it compresses ensures water resistance. When it is pulled out to set the time and you forget to push it back and screw it down, that protection disappears.
This is why Time2Seiko does not cover water resistance in its 2-year warranty. Not because our watches are fragile around water, but because it would mean making you a promise we cannot keep on your behalf. If the crown is not screwed down and water gets in, it is not an assembly defect. It is a forgotten habit.
Our 2-year warranty covers any defect the watch may encounter: movement, finishes, components. What it does not cover is water resistance. Not because we dodge our responsibility, but because water resistance depends on one habit only the wearer can perform: screwing down the crown. Everything that leaves our workshop is checked before shipping.
- Before washing your hands: nothing to do, 3-5 ATM is more than enough
- Before the shower: our recommendation is to remove the watch. It will probably cope, but it is not a use we officially endorse
- Before the pool or the sea: remove the watch. Same reasoning
- If you keep the watch on: check that the crown is properly screwed down before any contact with water
This advice may seem conservative for a watch marketed as water resistant. It is honest. We would rather tell you the truth than sell you a dream and see you end up with a damaged movement.
What you can do with your Seiko mod every day
To be precise, here is what our customers do without any problem, and what we recommend avoiding:
| Usage | Possible? | Recommended by Time2Seiko? |
|---|---|---|
| Rain, hand washing, splashes | Yes | No restrictions |
| Dishes, cooking | Yes (crown screwed down) | Remove if possible |
| Daily shower | Possible (crown screwed down) | We recommend removing it |
| Swimming pool / sea | Possible (crown screwed down) | We recommend removing it |
| Scuba diving | No | No |
The important nuance: possible does not mean zero risk. A properly closed 5 ATM watch can handle the pool. But chlorine attacks gaskets over time, thermal shocks accelerate their ageing, and anyone can forget the crown once. We would rather you keep your watch for a long time than see it come back damaged.
- Check the crown before any contact with water: two seconds, one habit
- Rinse with fresh water after contact with seawater or chlorinated water, if you kept the watch on
- Have the gaskets checked every 2 to 3 years: silicone gaskets age, even without incident
To discover all our models assembled in France, browse all our watches with a 2-year warranty.
Frequently asked questions about Seiko mod water resistance
Is a Seiko mod waterproof?
Yes, provided the crown is properly screwed down. Our watches are assembled piece by piece with new gaskets greased with waterproof silicone. Across more than 500 watches delivered and 50 customer reviews published on the site (average rating 5/5), we have had no returns related to water resistance. That is not a promise: it is a concrete result.
Can you wear a Seiko mod in the shower?
Technically yes, if the crown is screwed down. Our recommendation remains to remove the watch for the shower. Not because it is fragile, but because forgetting the crown happens quickly, and the combination of heat, steam and cosmetics wears gaskets out faster. Hand washing, rain, splashes: no problem at all.
Seiko mod in the pool: what is the risk?
The pool combines dynamic pressure (arm movements) and chlorine, which attacks gaskets over time. Our recommendation is to remove the watch before diving in. If you forget and the crown is properly screwed down, it will very likely cope. But it is not a use we guarantee or encourage.
How do you check the water resistance of your Seiko mod?
The basic habit: check that the crown is properly screwed down before any contact with water. If in doubt about the state of the gaskets (condensation under the crystal, a feeling of moisture), entrust the watch to a watchmaker for a check. Gaskets should be checked every 2 to 3 years, even without incident.
What water resistance does a Time2Seiko-assembled Seiko mod have?
Our watches reach 3 to 5 ATM depending on the case. That level easily covers rain, hand washing and everyday splashes. For the shower or the pool, our advice remains to remove the watch. The 2-year warranty covers any defect in the watch, with the exception of water resistance.
In conclusion
A Time2Seiko watch means more than 500 watches assembled piece by piece in France, new greased gaskets at every assembly, 50 customer reviews published on the site with an average rating of 5 out of 5 stars, and zero water-resistance-related returns since launch. The water resistance is there. What we ask of you in return is a single habit: check that the crown is screwed down before going near water. And if you want to play it safe, remove the watch for showering and swimming. It will be waiting for you.
If you are looking for your next timepiece, discover our water resistance testing service or browse all our models: each one leaves our workshop in France with its 2-year warranty and a human after-sales service you can reach with any question.
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