HM King Rama 5 became the 5th king of the Chakri dynasty in 1868. The first coins minted during his reign were the 1 Solot tin coins. Issued in 1868 (B.E. 2411) the coins had three crowns or Chula Mongkut (privy seal of HM King Rama 5) on obverse and an Elephant within a Chakra (wheel) on reverse. Several patterns made out of Copper and Silver in the same year are known to exist.
In 1869 (B.E. 2412), silver coins for 1 Fuang, 1 Solot and 1 Baht were issued carrying same design as shown above.
Click to see Checklist of Chula Mongkut-Chakra coins.
Note that in Standard Catalog of World Coins 1801-1900 published by Krause Publications, these coins are stated to have been issued during reign of HM King Rama 4. This is not correct as the privy seal of HM King Rama 4 was different and as shown below.