https://www.cointalk.com/threads/roman-coin-with-the-longest-legend.330700/ It includes some Roman provincial coins. We don't expect Greek coins to have long legends. But, coins with Arabic legends might have long legends; most Arabic coins have only legends! However, not many of us collect coins with legends we can't read. The exception is perhaps "Turkoman figural bronzes" from the period around AD 1200 which do have figures. Sometimes the Turkoman peoples are called "Foes of the Crusaders." They are easy to collect because there are several books about them. Most commonly cited are volumes 1 and 2 of "Turkoman Figural Bronze Coins and Their Iconography" by Spengler and Sayles. Unfortunately, it is not complete because Spengler took ill and died before volume 3 could be written. Wilkes completes the list, however without the explanation, translation, or commentary, in "Islamic Coins and Their Values." Here is one with a very long legend. 28 mm. 15.81 grams. Qubt al-Din Muhammad b. Zengi, AH 594-616, AD 1197-1219. Struck at Singar, AH 600 = 1203, a year when the crusaders of the Fourth Crusade reached and besieged Constantinople. S/S 82. Wilkes 1276. Sayles thought the bust is that of Athena, of the famous statue formerly in the temple at Athens, that was pulled down that year by superstitious citizens of Constantinople. He has pages of discussion. You can see it has a lot of letters. It mentions his name, his overlord Calif al-Nasir, and the Sultan's name, 'Adil Saif al-Din Abu Bakr. I don't know how to count Arabic letters, but I can count the letters in the English transliteration given by Spengler. On the obverse there are 70 and on the reverse 77 in the middle, 8 to the left, 19 to the right, and 4 above. So, in total there are 178 letters. Beat that!