IWC Portugieser Chronograph IW371605

The case measures 41mm across and 13mm thick, with a 20mm lug width. Case material: Stainless steel. Case size alone is a poor guide to how a watch wears; lug-to-lug length and how the bracelet drops off the case matter more, which is why we suggest trying one on before you commit.

Automatic chronograph (in-house Cal. 69355 in current production; earlier refs use ETA-based Cal. 79350). Power reserve is 46 hours. It beats at 28,800 vph. The movement uses 27 jewels.

It is rated to 30 meters, about 98 feet. That covers rain and hand washing. It is not rated for swimming. One caution that applies to every watch on this page: a water resistance figure describes a new watch with fresh gaskets. On a piece that is years past its last service, treat the rating as unknown until it has been pressure tested.

IW3716 = Portugieser Chronograph family; 05 = specific dial variant (e.g. silver dial, blue hands). Reading the reference is the fastest way to confirm that a watch is what the seller says it is, before you get anywhere near the movement.

"Portugieser Chrono", "Porto Chrono". Collector nicknames are not official IWC names, but they are what people actually search for and what they are called across a showroom.

Yes. We buy this reference outright, and we lend against it if you would rather keep it. We are a family-owned San Diego buyer established in 2006, our appraisers are GIA-trained, and the appraisal is complimentary with no obligation to sell. You can bring it to our Gaslamp showroom at 907 Sixth Ave or start online. If you are looking to buy this reference instead, tell us and we will let you know when one comes in.