10 rials is SH 1344 (1965), 5 rials looks the same, or SH 1343 (1964). A close-up would help. Two rials - cannot see. The date is under the denomination, close to the rim. I'd need a better picture of it to say the year. So far everything I see is Cupro-Nickel.
Comparing the colors of the coins I can safely say 2 rials is Cu-Ni as well.