The valley of fear act 1,scene5

The sergeant picked up a card which lay beside the dead man on the floor. The initials V. V. and under them the number 341 were rudely scrawled in ink upon it.

It was a good-sized hammer which had been lying on the rug in front of the fireplace—a substantial, workmanlike hammer. Cecil Barker pointed to a box of brass-headed nails upon the mantelpiece.