Not All “904L” Claims Are Real
Many replica sellers claim “904L Oystersteel” — but only top-factory superclones actually use it. 904L costs 3-5x more than 316L to source and machine. Cheap replicas use 316L (or worse) and lie about it. Here’s how to verify what you’re actually wearing.
Three Verification Methods
1. Weight Test (Easy, Free)
904L and 316L have the same density (8.0 g/cm³), so weight alone doesn’t distinguish them. BUT: a genuine 904L superclone should weigh within 2-5g of the authentic reference (Submariner: ~155g). If your “904L” Sub weighs 120g, it’s probably hollow 316L or brass.
2. Polish Test (Moderate, Visual)
904L takes a warmer, deeper mirror polish than 316L due to higher nickel content (23-28% vs 10-14%). Side-by-side in sunlight, 904L polished surfaces have more “depth” — the reflection appears to come from within the metal, not just the surface. 316L appears flatter, cooler, more reflective but less “deep.”
3. XRF Spectrometry (Definitive, $50-$200)
A handheld XRF gun (available for rent at ~$50/day from tool rental companies) measures exact elemental composition in 30 seconds. 904L shows: 23-28% nickel, 4-5% molybdenum, 1-2% copper. 316L shows: 10-14% nickel, 2-3% molybdenum, no copper. This is the definitive test — it proves the alloy grade beyond dispute.
DR.WATCH Guarantee
Every Rolex-branded watch in our collection uses genuine 904L Oystersteel — verified by our quality control process. We stand behind this with our 1-year warranty. If any customer can demonstrate via XRF that their DR.WATCH Rolex reference is NOT 904L, we provide a full refund + replacement. Free worldwide shipping.
