The 16570 is widely considered the last "true" tool watch Rolex ever made. It fits the wrist better than the modern 42mm versions and retains that vintage soul with modern reliability. But if you’re looking for a Polar, this M-serial is the one to get. For those who know their references, the **M-serial** represents the "Goldilocks" era of the 16570. It sits right at the intersection of vintage aesthetics and modern mechanical upgrades: * **3186 Movement:** This late-production serial features the upgraded 3186 movement (instead of the 3185), offering a smoother hour-hand jump and the Parachrom bleu hairspring for better magnetic resistance. * **No-Holes Case:** It features the cleaner, more modern lug profile without the drilled spring bar holes, giving it a slightly more refined look on the wrist. * **Engraved Rehaut:** Being a late M-serial, it includes the "Rolex" engraving on the inner rehaut, a hallmark of the modern era. * **Solid End Links (SEL):** The bracelet feels substantial and lacks the "rattle" of earlier 5-digit references. # Condition * **Case:** Excellent condition with thick lugs and sharp chamfers. It hasn't been over-polished into a soap bar. * **Movement:** Recently serviced, running perfect. See timegraph photo. * **Dial/Hands:** Flawless Polar dial. The contrast between the black surrounds and the crisp white lacquer is why this watch is a classic. * **Bezel:** The radial brushing is still intact, and the black enamel in the numerals is deep and full. # Specs * **Model:** 16570 Explorer II * **Case Size:** 40mm * **Water Resistance:** 100m * **Complications:** GMT, Date 📜 Includes: Watch only 💵 Price: $8400 shipped 2-day air 📍 Location: San Diego 🔒 Authenticity: 100% guaranteed 📦 Domestic Shipping (CONUS) preferred 🌍 International Shipping: Can be negotiated, you pay the cost 💳 Payment: Paypal F&F, Venmo or Face-to-face deal in San Diego I have excellent ratings here on Reddit and can provide additional references at your request. Happy to facetime and show the watch. Please PM me with any questions or additional picture requests. \*\*\*Please check out my other listings!\*\*\* Thanks all!