The Gyarados 26/123 Reverse Holo card from the Mysterious Treasures set is a vintage collectable Pokémon card manufactured by Nintendo in 2007. This Stage 1 Water-type card features the iconic character Gyarados with 120 HP and a Reverse Holo finish, making it a sought-after addition to any Pokémon TCG collection. The English-language card, illustrated by Mitsuhiro Arita, is part of the Unlimited series and is a rare find for collectors looking for unique and valuable cards from the Pokémon universe.