Timepiece?

You know, I have never found anything worth a scratch when I walk down this river bank.  I would spend hours with my trusty trowel and pale, searching for buried treasure or old bones.  And, now of all times, I find this rickety pocket watch just sitting on top of the grey sands.  Shows just how much the universe seems to value a hard day's digging.  The piece seems to be in working order, but when I put it up to my ear I hear the damnedest thing:  the sound of a jet turbine as if it is just about take off.  I have also never come across anything quite as peculiar as that.   So, I take it my recent discovery down town to the only fella I know who might be able to figure it out,  Jasper Hesten.