Other Thailand Coin, Just Need A Quick Date Translation

You'll find a numeral translator at the front of Krause, but the pics for a couple of the numerals look different to how they actually appear on the coins. You can also find them on wikipedia, but they're not very well drawn there, either. Fortunately, their appearance on the coinage is fairly consistent, once you learn to recognise them.

On your coin, the six symbols visible on this side, around the central hole, are (from left to right) two letters (abbreviation for "Buddhasakarat", the Thai word for "Buddhist Era") and the numbers 2 4 5 and 7.

To convert from Buddhist Era dates to AD dates, simply subtract 543. BE 2457 minus 543 equals AD 1914.

I should also point out that this year (2457) was only the second year the BE calendar was used on Thai coinage; on most earlier coins, the Bangkok Era calendar was used instead. So if you find a coin with only three numerals in the date, it's using the earlier calendar, and dates from before 1913.