The only thing I see that is unusual on the 10c is on the head. Is it raised? FROM ONLY PHOTO: Marks like this can result when a knife is dragged into a coin at an angle. There is Nothing (?) to speak of on the reverse and no design that would produce a "clash mark" in that location on the head. If you can magnify that area, others will respond.
Shiela when a die receives a die clash it's because there was no coin in the collar to stop the 2 dies from hitting . So the damage will be spread over a large area . Until they are noticed all clashed coins will be clashed in many places . Even after they will try to polish out as much as the clash as possible but there usually still will be marks , just not as deep , in more than one place . Of course there are exceptions to every rule . Hope this helps a little .