And here's another with die clash marks like yours by the ribbon, and in front of Victoria too. They are the remnants of Britannia's drapery etc. from the clash with the reverse die.
Just die clash marks where the dies have come together without a blank in between, resulting in transferring of some of the opposite side's design into that die and so causing permanent damage that then is transferred to any subsequent coins struck from that die. Very common, especially in the Viccy penny series.