if you are saying this plate has writings in the "Old Persian Language...then..yo ur are trying to tell us that this "tin plate"...might be over 2500 years old...somehow i don,t think so...i,m thinking..its more like 75/100 years old..if that....as Persia was renamed Iran in 1935..my link is for the dates of Ancient Persian language...
History of the
Persian language
Proto-Iranian (ca. 1500 BC)
Southwestern Iranian languages
Old Persian (c. 525 BC - 300 BC)
Old Persian cuneiform script
Middle Persian (c.300 BC-800 AD)
Pahlavi script • Manichaean script • Avestan script
Modern Persian (from 800 AD)
Perso-Arabic script
The Old Persian language is one of the two directly attested Old Iranian languages (the other being Avestan). Old Persian appears primarily in the inscriptions, clay tablets, and seals of the Achaemenid era (c. 600 BCE to 300 BCE). Examples of Old Persian have been found in what is now present-day Iran, Iraq, Turkey and Egypt[1] the most important attestation by far being the contents of the Behistun Inscription (dated to 525 BCE). Recent research into the vast Persepolis Fortification Archive at the Oriental Institute at the University of Chicago have unearthed Old Persian tablets (2007).[2] This new text shows that the Old Persian language was a written language in use for practical recording and not only for royal display