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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.

Discover everything about Seiko Santos mod watches in this comprehensive guide. Learn what makes a Santos mod (square case + NH35 movement), the Cartier Santos design history from 1904, key design elements (Roman numerals, exposed screws, integrated bracelet), typical specifications (38-40mm, sapphire crystal), pricing ($300-600), and how to choose between pre-built mods and DIY builds. Includes technical details, design authenticity, and buying recommendations.