[Introduction] The Casio G-Shock G-Steel GST-B100 is a powerful fusion of industrial metal design and advanced Japanese technology. This "Tough Solar" model features a multi-layered case construction that combines stainless steel with resin for legendary shock resistance. Its most distinctive visual element is the rotating turbine sub-dial at 9 o'clock, which indicates battery level and alarm settings while adding a dynamic, mechanical aesthetic. Designed for the modern adventurer, it balances professional style with the extreme durability for which the G-Shock brand is world-renowned. [Historical & Collector Value] The GST-B100 series represents a significant milestone in the G-Steel evolution, being the first in its line to feature an entirely analog display while incorporating Bluetooth connectivity. This model is highly regarded by enthusiasts for its "Connected" engine, allowing for automatic time adjustment and easy watch setting via a smartphone. Collectors appreciate this specific reference for its bold 53mm presence and the turbine dial inspiration, which pays homage to jet engine blades. It remains a staple for those who value G-Shock's technological prowess in a sophisticated, steel-clad package. Specifications ◇Brand: Casio ◇Model: G-Shock G-Steel ◇Reference: GST-B100 ◇Case size: 50mm ◇Movement: Tough Solar (Solar Powered) ◇Case material: Stainless Steel and Resin ◇Dial: Black ◇Crystal: Mineral Glass ◇Functions: Bluetooth Smartphone Link, Chronograph, Date, Alarm, Battery Level Indicator, Dual Time, LED Light ◇Bracelet / Strap: Black Resin Strap ◇Clasp: Buckle ◇Water resistance: 20 bar ◇Country of manufacture: Japan (Movement) ・Condition Well preserved condition with only minor signs of normal use. The stainless steel bezel and case show light surface marks consistent with regular wear. The resin strap is supple and in good condition. ・Service History The watch has been checked for basic operation and is functioning at the time of listing. As a Tough Solar model, it is currently charging and maintaining power through light exposure. Future maintenance may be required depending on usage and the buyer’s standards. ・Shipping & Customs Ships from Japan, carefully packed. International shipping available. Customs duties/taxes are the buyer’s responsibility.