The Tested XX tang stamp was first introduced by W.R. Case & Sons in 1920. This tang stamp has become legendary among Case Collectors and the entire knife community. To celebrate th 100th Anniversary of this tang stamp, Case and Shepherd Hills have teamed up to premier this exclusive dual tang commemorative series. The primary blade on each knife will contain a commemorative Tested XX tang stamp and each knife will also have a secondary stamp that features the new 2020 Dot Dating System tang that was introduced this year to mark the new era of Case Dating. Each knife features smooth Antique bone handles, Propeller XX shields, Strikelined bolsters and a commemorative blade etch on the primary blade.