4 Reviews ← exclude selected types ← exclude selected tags Sapphire crystal and 10-bar water resistance at ¥33,000 — about $208 — is the bit that makes the Casio Edifice EFS-S660 stand out. Most solar chronographs in that bracket (even from brands like Seiko) use mineral glass and stop at 50 meters. The EFS-S660D-1AJF features a polished stainless steel case with an integrated bracelet and one-touch three-fold clasp, a blue chronograph seconds hand, and 129 grams on the wrist. Both sit in a 45.3 × 38.3 × 11.6 mm case, keep width under 39 mm, and that's the main reason why the series is "wearable." Meanwhile you can also check out the Casio Edifice EF-527D-1AVEF on Amazon.