One-at coin

The at coin was a low-denomination coin used in the traditional pre-decimal currency system of Siam. The at represented the unit known as the att or at, valued at 1⁄8 of a fuang or 1⁄64 of a baht. At coins were commonly issued during the Rattanakosin period and circulated widely as part of everyday small transactions. Early coins were cast in the characteristic pod-shaped "bullet money" style, while later issues were struck as flat round coins as Siam modernized its currency system. The at, along with other non-decimal subunits, was discontinued when Thailand adopted the decimal baht–satang system in the early 20th century.