Process notes
Case backs
Case-back process | 304/316 and exhibition
Snap, screw-down or screw-fixed backs in 304 or 316/316L; solid backs can be laser-engraved or chemically etched. Exhibition mineral crystal is coded BKM; sapphire is BKS.
Stainless 304 / 316L
304 is a cost-effective general grade (BK304); 316/316L is more corrosion-resistant (BK316) for mid-to-high lines and higher WR.
Solid backs
Snap, screw-down or screw-fixed. Solid backs can take laser text/artwork or chemical-etch texture.
Exhibition backs
Mineral crystal (BKM) is lower cost with a slight green-gray tint; sapphire (BKS) is harder and clearer, with optional AR coating.