Value activity in Volume 4 is centered on more of the modern issues. In Kuwait, starting about 1990 the number of value changes increases noticeably and the sizes of the value increases also are striking. In Macao, stamps from 1981 to mid-2000s era had considerable gains. An example is Scott 539, the 1.30p Dr. Sun Yat-sen souvenir sheet of 1 of 1986. It leaps to $62.50 mint, never hinged and $45 used, from just $12 mint, never hinged and $9 used in last year’s Volume 4. There were more than 900 value changes in Latvia with sharp increases for stamps issued under Russian occupation in 1919, Scott 2N1-2N36.
Volume 4 is the first Volume of the 2011 catalogues that features the new country alignments. The 2011 edition of Volume 4 contains countries of the world alphabetically from the J through the M countries.