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◆ Casio5 min
Casio G-Shock MR-G MRG-D5000: a screwless blue sapphire case, 20 pieces, and the most expensive G-Shock ever
Casio machines the square G-Shock's outer case from blue sapphire and assembles it without a single screw, borrowing from Japanese timber joinery because sapphire cracks where screws concentrate stress. Still 200m water resistant. 20 pieces worldwide, reported at USD 80,000.
October 6, 2026