The Old Silver Watch.

Mary Collins dies leaving two children; Mildred ('Lucie') and Frank. On her deathbed, she gives Frank a silver watch that belonged to his father. The children are separated from each other and grow up with foster parents. Lucie and Frank meet again when he rescues her from a thief. They fall in love, unaware they are brother and sister. On their wedding day Frank is shot by the vengeful thief. The bullet however is stopped by the silver watch. On seeing the watch, Lucie realizes that they are brother and sister; the marriage is cancelled.