More than 14,500 value changes are spread among the 96 countries in Volume 6.
Activity was particularly heavy in Yugoslavia with more than 4,000 changes with increases outnumbering the decreases.
In Yemen, there are dozens of new listings for postage, air post and postage dues from the 1960s.
Other countries with sizeable number of value changes are South West Africa (1,093), Tanzania (1,066), Sri Lanka (1,063), Ukraine (1,046) and Turks & Caicos Islands (848).
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