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A1MODS / COLLECTIONS

Nautilus Mods

Geometric cases and a flowing transition to the bracelet define Nautilus mods. Choose Open versions with a view of the mechanism or Closed versions with a closed dial.

9 variants · Free shipping within Germany

How to choose your Nautilus mod

Open and Closed versions have visibly different dials. Compare case colours and bracelets too: a dark combination has a different feel from silver or rose gold. Movements and dimensions are listed for each product.

Our product pages show each variant with its own photos and specifications. Standard models are delivered within Germany within 5 working days of receipt of payment.

Help with watch sizing

Your own combination

Want a different combination of colours or components? We discuss what is possible and agree on price and timing before you place your order.

Plan a custom build

A1mods is an independent custom watch project and is not affiliated with Seiko Watch Corporation.