transformable watches from my childhood

has anyone gotten a transformable watches during their childhood? although i don't have it or the picture now, but i vaguely remember that i used to wear a optimus prime watch, and it's transformable too. first you got to detach it from the wrist of the watch, from there you transform it in 2 easy steps to a truck. afterward you attach it back to it. there's many types beside prime, i also got a starscream watch where it transforms into a jet. the time slots is located on top of the jet's body. so has anyone wore it before?