cover Luxembourg, 1952, 80c-10fr CENTILUX (278, 279, C16-C20), five covers, each franked with a complete set, comprising one unaddressed & uncacheted first day cover, and four others with CENTILUX 4 Jun 52 c.d.s. cancels on registered covers to the U.S., opened at B., two are oversized, fine-very fine, Scott retail (as used stamps) $985.00, Michel DM2,960