Digging around in my watch drawers and came across this vintage watch. It's a Hamilton 987S( or 5). Serial number SS56069. I know it is supposed to have a screw on crown cap, and the balance staff is broken, and the crystal is rough. I suspect this is a watch worthy of some attention. Thought I'd run it by the wristwatch guys and see what I have here. Is it common? Rare? Valuable? Junk? Thanks in advance.