Seiko Mod Guide

Compare the Seiko 7S26 and 6R35 movements across power reserve, accuracy, hacking, hand-winding, and price tier. Find out which Seiko caliber is right for your next watch.

Learn every movement series used in Seiko mods. This guide covers the NH automatic family, VK meca-quartz chronographs, and Miyota alternatives, with specs and use cases for each caliber.

What is the Seiko 4R34 movement? Learn its full specs, GMT crown operation, real-world accuracy tips, and how it compares to Miyota and ETA GMT calibers in 2026.

What is a quartz movement and how does it work? This guide explains the 5 types of quartz watch movements, compares quartz to mechanical, and helps you choose the right movement type.

Grand Seiko 9S movement guide: every caliber from 9S65 to 9SA5, Dual Impulse Escapement explained, GS accuracy vs COSC, and how 9S compares to Rolex and Omega movements.

Complete guide to Seiko 6R35 movement: 70-hour power reserve, accuracy specs, comparison with 4R36 and NH35, reliability data, and which SPB watches use it.

Complete guide to automatic vs mechanical watches: key differences, how they work, pros and cons, and which type suits your needs. Expert comparison for 2025.

This guide explains each NH caliber, their practical differences, and how to choose the right one for your watch project or purchase.