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.

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.

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.

Seiko 6R35 vs 4R36 vs NH35 comparison: 70hr vs 41hr power reserve, accuracy, reliability. Which movement is worth it for your watch? Complete buying guide.

Comprehensive comparison of Seiko 6R15 vs 6R35 movements. Learn the key differences in power reserve, accuracy, and which caliber is right for your watch collection.

Discover what Seiko mod watches are, why they're popular, and how they compare to original timepieces. Complete guide to custom Seiko modifications with expert insights.

Learn what Seiko 5 GMT is: 4R34 caller GMT movement explained, SSK001/SSK003/SSK005 specs, how to use GMT function, caller vs true GMT differences. Complete 2026 guide to Seiko 5 Sports GMT watches.

Compare Seiko 4R38 vs 4R36 movements: open-heart vs closed dial, 23 vs 24 jewels, Presage vs Seiko 5 applications, price differences, specifications. Which Seiko movement is better? Complete 2026 comparison guide.