The box is Douglas fir with the mechanism being made of Stainless steel , brass ,  birch plywood , maple , phosphor bronze
and a small amount of Delrin  .

The cat himself is carved from lime wood  and the eyes made from Delrin balls.
The mechanism inside the head is made from brass , phosphor bronze and spring steel .

The Campbell’s soup tin is a solid piece of steel with a label printed from a hand painted original ( by Sarah Smith ).
The mechanism comprises two brass ratchets and three camshafts , with a fairly complex sequence .

                                                              A video of it working can be seen here