A chain, ribbon, or cord fastened to a watch, and either passed around the neck or secured to some part of the clothing.(noun)
The Century Dictionary (Public Domain)
Use "watch-guard" in a sentence
"Behold him in pepper-and-salt pantaloons, with his watch-guard round his neck."
"He shut it up; he locked it in with a small key attached to his watch-guard; he restored the other papers to order, closed the repository, and sat down without further remark."
"Not many minutes elapsed before, kneeling upon his knees, she was stroking his tawny beard and plaiting it in threes, pulling his long moustache, playing with his watch-guard, and laughing in his face with the pretty audacity of six."