Very clean and very fine registered cover sent from Nauru to Berne Switzerland via america.  the cover was mailed March 21 1918 and received in Berne Switzerland  June 28 1918. .  Stamps are GB Great Britain George V definitive overprinted for use in Nauru and are Scott 1,2, 4 and 6.  Nice manuscript Registered as well as a small boxed Pleasant Island (Nauru) registration with hand written register number.  Appropriate cancels on the back of the cover.