[Model number: AN3666-51A] The "Chronograph Challenge Timer"was released in 1973 as Citizen's first watch with a full-scale chronograph function. Because the push button located on the 12 o'clock side of the case looks like a horn it was nicknamed "Tsunokurono". Based on the "Citizen Collection"record label Tsuno Chrono which reprinted the design of the "Chronograph Challenge Timer" a limited model with a design motif of popular Star Wars characters. A dial that expresses the R2-D2 body mold with press-processed unevenness. The effective placement of blue and red on a white base expresses the R2-D2-likeness. R2-D2 peeking through the small dial at 6 o'clock is also attractive. Japan limited special BOX specification. Limited to 600 bottles. *This product is scheduled to be released on September 29th. ・Case material: Stainless steel (partly jet black color plating)・Windshield material: Spherical crystal glass ・Belt material: Stainless steel ・Specifications: Quartz ・Chronograph ・Engraved back lid ・Water resistant to 5 ATM