The Solid Caseback. Mirror polished. For SKX builds. The standard solid caseback — the simplest, cleanest way to close a build. Mirror-polished 316L stainless steel, made for SKX cases running Seiko NH movements. Water pressure tested to 200m — properly installed and tightened, it's Diver's-200m rated. 1.3mm thick; if you're chasing a lower profile, the 0.75mm slim version trades down to 100m for the thinness. Clean and closed.The classic back — solid, polished, 200m. Solid steel.A plain mirror-polished cover — the cleanest look a build can wear. Mirror-polished 316L.Machined stainless steel, polished to a mirror. 200m rated.Water pressure tested to 200m, properly installed and tightened. Fits SKX + NH.All SKX cases running Seiko NH movements — SKX007 and SKX013 families alike. Heads up — fit & install Fits all SKX cases running Seiko NH movements. New to this? Seiko Modding: The Complete Build Guide walks through the whole build. Specs What's Included Fitment How To Mod Specs Quality Swiss Production Quality, ISO 9001 Certified Material 316L Stainless Steel Surface Finish Polished Thickness 1.3mm Water Resistant 200m Fit SKX Cases using NH movement 1x Caseback All photos of watches with modification parts are for illustration purposes only and are not included with the purchase. Fits all SKX cases running Seiko NH movements. Pairs with: Watch Cases Rotors & Bridges Seiko Modding: The Complete Build Guide (2026)
