Tenneyson my 3.5yr old, youve seen him Meggymoo -the grey! He developed his when he was turned out as a youngster.
NEVER lame on it and has passed a 5 stage vetting with it! Do not worry about an old curb- some of the best eventers around have the same and worse! and never go lame.
If it is hard to touch and cold do not worry and give the mare a chance!
I hope im not too late and you havent already discounted her!