This exhibit comprises Greek and Ottoman postage stamps, which, following the progress in the
advancing of the Greek Army and the liberation of Thrace, were obliterated as follows:
(a) Western Thrace Administration, (b) Thrace Administration, (c) Thrace High Commission.
This exhibit considers mainly errors created during the designing, engraving and printing of a
postage stamp, while as variety any irregular element in this process such as color, paper, watermark
or perforation.