RE: [Demo notebook] Collector’s comparison desk: dimensions, fit and documented differences · RWI-28150

Case 15 — Crystal types: sapphire, mineral and acrylic trade-offs for daily wear

On anti-reflective coatings: inner-surface AR cuts glare without wear concerns. Outer-surface AR improves legibility further but can scuff over time, and the scuffs show up as hazy patches in certain light. When comparing two watches, check which surfaces are coated. Spec sheets often just say 'AR coated' without saying where.