610, to Caesar, 3 letters
610, to Cicero, 3 letters
Early seventh-century year, 3 letters
Ten times LXI, 3 letters
Twice CCCV, 3 letters
Year in which Muhammad began preaching in Mecca, 3 letters
640, in old Rome, 4 letters
The year 640, 4 letters
Ten-seventeenths of MLIV, 4 letters