I have an 1871 Victoria Gothic Florin which has a 
on the obverse.
It is a circular hairline crack in the die with a bit of a blob at the rim.
It is so feint that I only noticed it when I photographed the coin.
Has anyone ever come across this particular error before?
The coin itself is extremely fine – does the minting error add value to the coin?
Any help would be much appreciated.