You need to look at this clever caseback on the Casio G-Shock MRG-BF1000R Frogman

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Titanium armor-clad:
An MR-G for the sea
Behold the full-metal form of the MR-G, now with a highly airtight structure delivering ISO 200-meter water resistance. The shock-resistant structure with a titanium exterior houses the watch’s dual identities. The titanium exudes a profound, powerful sense of presence, the assortment of multiple components gives the structure an impression of intricate beauty, and meticulous attention to detail extends to every facet of the componentry in the finishing. An MR-G diver’s watch, crafted with a level of passion for design befitting the flagship line of the G-SHOCK brand.
Features
Sophisticated integration of strength and beauty: Titanium armor for a highly airtight exterior
Titanium is used for strength - from key parts like the case, bezel, and case back, to miniature components such as the crown, buttons, and screws. The watch is made up of an intricate combination of over 70 exterior components, including the O-ring waterproof sealing and buffers that strengthen the shock-resistant structure. This original construction maintains water resistance, a quality demanded of diver’s watches, while achieving a dignified form worthy of the MR-G line.
*Some parts are not shown in the photo.
Structural beauty with separate parts and face-guarding functionality
The newly developed protective structure offers enhanced strength, with multiple buffers made of fluoro rubber installed between the parts that make up the bezel and in the space between the bezel and case. The included face-guarding functionality helps to absorb shocks from the front, as well as protecting the crystal. The face-guarding components are made with lightweight, rust-resistant titanium and treated with a deep-layer hardening process and DLC coating to provide even greater strength and abrasion resistance.
Clad Guard Structure adapted for diving
Protective components are built into the crown and buttons to help absorb impacts to the module. The crown features an airtight screw-lock construction and incorporates buffering components made of highly water-resistant fluoro rubber. A special construction keeps the MR-G logo, engraved on the crown, horizontally aligned when the crown is screw-locked.
Sapphire crystal screw-lock case back: Functional beauty from an inventive combination of materials
Sapphire crystal is press-fit into the pure-titanium screw-lock case back, ensuring a highly airtight structure while maintaining the built-in antenna’s radio wave reception sensitivity. Casio passion for refinement, down to the finest details, is evident everywhere in the design, with vibrant blue vapor deposition, an engraved first-generation FROGMAN diving frog character, and more.
*Due to the screw-lock construction of the case back, the orientation of the logo and lettering on it may not match up perfectly with the dial.
Dura Soft (fluoro rubber) band for a comfortable fit on the wrist
Flexible and durable fluoro rubber is used for the band, Ti64 titanium alloy for the buckle and band loop. Simply remove the side pins while pressing the buttons on the lugs’ undersides to quickly and easily swap out the band. Handy for performing occasional maintenance such as cleaning.
ISO 200-meter water resistance to support diving activities
The strong, lightweight, rust-resistant titanium case incorporates a crown and case back that both feature a screw-lock construction. These and other features throughout the design keep the watch air-tight to ensure ISO 200-metre diving water resistance.
Dive mode and tide graph mode: With full-analogue display
In dive mode, dive times and surface interval times are indicated by forward and reverse rotation of the hands. In tide graph mode, the watch displays tide graphs for a selected diving spot along with local time. Functions useful for diving are offered with full-analogue display.
Solar-powered timekeeping with Bluetooth® and radio control for enhanced accuracy and reliability
Super Illuminator (high-brightness LED light) for maintaining watch readability in the dark
Scratch-resistant, highly transparent sapphire crystal with an anti-reflective coating

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