Niewmismatic Error Coins

 South Thailand Tin Coin: Songkhla 400 bia.
These coins were produced beginning from the end of 18th century and the second half of the 19th century. There were issued under the authorized of the local governor rather than the Siamese King.

These series bear the name of the principality in Thai "Songkhla", Jawi script Malay "Negeri Singora" on the obverse and Chinese "Sung-Cheng-Tung-Pao" (Singgora Currency) on the reverse.
The coins were issued in three denominations: 400 bia (Corresponding to 1/2 fuang, or sik), 200 bia (1/4 fuang, or sio) and 100 bia (1/8 fuang or att). The 400 bia pieces are the more common denomination but they are still exclusive; all types of 200 bia coins are rare, while all types of 100 bia coins are very rare.
Reference:"Siamese Coins From Funan to the Fifth Reign" authored by Mr.Ronachai Krisadaolarn and my friend Mr.Vasilijs Mihailovs.

Read more: http://dniewcollectors.blogspot.com/2014/07/siamese-singgora-tin-coin.html#ixzz3UZ0FjzfH