Sign Of The Times

I am a time travelling salesman of clocks, so in ancient times I sell mostly mounds of earth equally spaced, a bit later they all go crazy for the standing stones, then around the enlightenment the infernal mechanical cogs, tuned to let a distinguished gentleman know when to go hunting, and just now, well there was a transition from crystal based time keepers, in most watches, to the new laser clock that relies on cobalt.