AR25 - Trajan L Κ

Year 20 of Trajan's reign in Egypt — the regnal year encoded in that Κ — fell just months before his death in August 117 AD, making this among the last Alexandrian tetradrachms struck in his name. The Alexandria mint operated on an Egyptian calendar year running from late summer, which means production of L Κ pieces would have overlapped almost exactly with news of the emperor's death reaching Egypt and the hasty transition to Hadrian's coinage.

The billon content by this point had degraded considerably from earlier Trajanic issues, a slide that would accelerate sharply under his successors.