Try This: House Number Sign

Hammer it home.

For the edging, we used scrap strips of copper sheathing. Use tin snips to cut them about 1/4 inch wider than the edge of your board. For the ends, cut the copper strips the same length as the ends of your sign. For the top and bottom of your sign, cut the copper strips about 11/2 inches too long. This excess will be folded up over the end copper and nailed into place. Nail the copper strips all the way around with two rows of copper tacks.