Watch size is 1 3/4 x 2 1/2". Octopus size is 2 x 1 1/2". I've molded them separately so you can mold the watch with or without it. I've posted pictures of molds with my painted sample, as well as the individual pieces and my original.

(PLEASE NOTE: The octopus tentacles are very fragile. Because of this, I filled the octopus mold completely with gumpaste and then cut out the holes and trimmed up any little spots with an X-acto knife.)