The four seasons are celebrated around the world—particularly in Japan. And also in this special edition of the NOMOS classic Tangente. The summer version, Tangente Ai (available from March 2020), features a sky-blue ring on its dial, dark blue numerals and indexes, as well as tempered blue hands. Its matching leather strap is colored with leaves from the Japanese indigo plant found on the island of Shikoku. With a 38-millimeter diameter, this model is the largest manual Tangente model. This special edition model is sold out in our online store and now exclusively available with our official retailers in Japan.