2c Carmine, Imperforate Vertical Coil (384V). Strip of four, tied by "San Francisco Calif. Sep. 6 1927" duplex cancels on 2c Sesquicentennial Exposition entire (U522) to Tacoma Wash., purple "Via First Airplane Mail Landing at Tacoma Wash" datestamp and wings, fresh and Very Fine, scarce on-cover use of this imperforate coil, with 1986 A.P.S. certificate