Fine stoneware mugs by Emma Lacey.  These are beautifully tactile and meticulously made hand-thrown mugs. The indent is made while the clay is still soft, and there's a softness to the satin matt glaze that makes you feel that you've worked that indent in with your own thumb. Very nice to hold.
 
There are three sizes - short, tall or espresso. Short is approx 7.5cm tall, 9cm in diameter and holds a generous 350ml. The tall is approx 9cm tall, 9cm in diameter and holds an extremely generous 450ml. 
 
Hand-thrown in the UK.