A is an imitation of a British gold sovereign, with nonsense legends. A very similar piece, but with the head of Edward VII, has been shown to me as having been found in a bottle of liquor in South America.
B and C appear to be Siamese (Thai) divisional coins, or counterfeits of them. Incidentally, both are upside-down in the photos, except the second photo of B. C should be a 5 satang piece, in nickel, Y# 36, dated BE 246x (where x is 1, 2, 3, 4, or 9, & BWE 2456 is AD 1913). I cannot read the last numeral, owing to the encrustation. The green colour is odd, but if it is picked up by a magnet, it is probably genuine. The same applies to B, except that it is a 10 satang piece, again in nickel, Y# 37, & the date is too faint for me to read, except to say that it appears to be BE 2xxx.
B and C appear to be Siamese (Thai) divisional coins, or counterfeits of them. Incidentally, both are upside-down in the photos, except the second photo of B. C should be a 5 satang piece, in nickel, Y# 36, dated BE 246x (where x is 1, 2, 3, 4, or 9, & BWE 2456 is AD 1913). I cannot read the last numeral, owing to the encrustation. The green colour is odd, but if it is picked up by a magnet, it is probably genuine. The same applies to B, except that it is a 10 satang piece, again in nickel, Y# 37, & the date is too faint for me to read, except to say that it appears to be BE 2xxx.























