

Lugs stay on wrists from about 6.5 in (lug-to-lug rule of thumb)
Last checked Oct 26, 2026
View on Heritus’s site ↗Built-to-order. 4 weeks turnaround. Seiko Mod Alpinist Overlander 39 mm Automatic FKM Rubber Strap Dual Crown Specifications: Seiko NH36A Caliber Automatic 41 Hours Power Reserve Vibrations Per Hour 21,600 bpm Bi-directional Winding Rotor No-Date Complication Regulated @ +/-5 Sec Per Day Characteristics: 316L Grade Stainless Steel Front Sapphire Crystal Innet Rotating Compas Ring Screw Down Crown Window Case Back Metal Bezel Dimensions: Case diameter: 39.5 mm Lug to lug: 48 mm Thickness: 13 mm Lug size: 20 mm Testing: The watch movement accuracy is tested and regulated prior and after assembling. The case is water tested at 5 ATM. Limited Warranty: 12 months limited warranty. The watch includes box, watch instructions, and accessories. We specialize in crafting personalized timepieces tailored to individual client preferences. It's important to note that this particular watch is not manufactured by Seiko and we have no affiliation with, nor do we represent Seiko or any other watch brand.
Details and photos come from Heritus’s website, last checked Oct 26, 2026. Specs were read automatically and may contain mistakes.
No videos feature this watch yet.







