This coin was issued by The Singapore Mint sometime in July 1990 in a plastic pouch costing S$5.60 per coin.
This particular error coin was given to me by my sister-in-law who had in fact returned it back to the bank after finding that it was not fully struck. Thankfully, she managed to retrieve it back from the bank the very next day and gave it to me.
The reverse of the coin was perfectly struck, I wonder how many of these pieces managed to get into circulation. Can this be the only Singapore error coin with the highest denominational value in private hands? Care to make an offer?