Ok really really long shot I know... but
I put the following search in google "Vintage Silver Pocket Watch By W Bolt Of Dawlish" and the fourth link down is a eBay hit, but it must be a very old listing as there is nothing there. The fifth hit is a listing of English clock and watch makers, I created an account on clockswatches.com so I could click through and see more about the listing but there was nothing more.
I thought if anyone on the internet knows about this watchmaker, someone on WUS might know. So if anyone has any information on William Bolt (of devon, Dawlish) or his father Richard Bolt (of Teignmouth) please let me know.