This was a finger abacus, on one hand, 0, 1, 2, 3, and 4 were used; and on the other hand 0, 1, 2, and 3 were used.
ðɪs wʌzɐ fˈɪŋɡɚɹ ˈæbækəs, ˌɔn wˈʌn hˈænd, zˈiəɹoʊ, wˈʌn, tˈuː, θɹˈiː, ænd fˈoːɹ wɜː jˈuːzd; ænd ɔnðɪ ˈʌðɚ hˈænd zˈiəɹoʊ, wˈʌn, tˈuː, ænd θɹˈiː wɜː jˈuːzd.