I thought I discerned a slight thunk emanating from inside my newly acquired Seamaster chronograph when I was changing the incorrect bracelet. It was a pretty subtle sensation at first, but recently I've felt it so clearly that I got spooked and decided not to wear it until I could investigate it properly. It may just be a Telltale Heart thing with my guilty conscience. Nothing I that I can see appears to be missing or loose, but then again I have no idea what I'm talking about. Am I missing something obvious?