A tablet found on the Greek island Salamis in 1846 AD (the Salamis Tablet) dates to 300 BC, making it the oldest counting board discovered so far.
ɐ tˈæblət fˈaʊnd ɔnðə ɡɹˈiːk ˈaɪlənd sɐlˈɑːmiz ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd fˈoːɹɾi sˈɪks ˌeɪdˈiː ðə sɐlˈɑːmiz tˈæblət dˈeɪts tə θɹˈiːhˈʌndɹɪd bˌiːsˈiː, mˌeɪkɪŋ ɪt ðɪ ˈoʊldɪst kˈaʊntɪŋ bˈoːɹd dɪskˈʌvɚd sˈoʊ fˌɑːɹ.