Vintage Japanese Watch Crystal Opener Tool Set – FRT Super Tension SS Type – Complete in Box Description: Offered is a vintage Japanese watchmaker’s tool set, branded FRT (Frontier Watch Tool Laboratory), model “Super Tension SS Type” (ART No. 921). This specialized tool is designed for removing tension-fit watch crystals (glass) from wristwatches. It works by expanding or releasing the tension ring, allowing safe removal of the crystal without damaging the case — a classic and essential tool in traditional watch servicing. The set includes the original hand tool with adjustment mechanism and a comprehensive selection of interchangeable toothed rings/adapters for different crystal sizes and profiles. A highly collectible and functional piece of horological equipment, especially appealing to watchmakers, restorers, and collectors of vintage watch tools. Contents: Adjustable crystal remover tool (metal, textured finish) Full set of interchangeable tension rings/adapters (various diameters and profiles) Additional accessory component (as pictured) Original box with printed lid Instruction leaflet (Japanese) Condition: Tool: good vintage condition, with normal signs of use Rings/adapters: complete set, with light oxidation/patina Box: original but worn, with visible age-related stains Overall: well-preserved, collectible, and likely still usable Origin: Japan Period: circa 1960s–1980s Registered insured shipping.