Originally Posted by UR003
However, I thought they would really be seamless, and I notice a seam on the inside of the heel.
Most shoes have that seam at the back of the heel; in that particular case, St Crispin has pulled it further to the inside. (Just as with JL's 'Jermyn II', where the seam is inside centre.)
If a whole cut has two seams, then there are two pieces of leather involved and it's no longer a whole cut.