Numerous philatelic forgeries exist of both the basic stamps and the overprints. Stamps were issued by both countries, most of which were overprints on existing stamps. Many of the overprints are rare, and command high prices among specialists in Mexican stamps. Turkey's stamps also have a complex history of overprints of interest to philatelists. Eventually, the crenulation foliation overprints the S1 foliation. The same overprints were also applied to stamps of the individual states. Such overprints almost always invalidate a stamp for postal use. Known are double, inverted, misspelled, wrong, partly or entirely missing overprints. Owing to different denomination and overprints, there are at least 104 variants catalogued. The last of these overprints were issued in 1939. Its first notes were overprints on the Victory Treasury Certificates. A number of varieties of the overprints exist. The Third Series is very interesting because of the myriad combinations in the overprints. Meanwhile, many revenue issues both before and after independence exist with provincial or state overprints. The Tangier International Zone received its own overprints beginning in 1927.