Did Snap-On really make a wood mallet?
How odd....
http://www.ebay.com/itm/Snapon-Wood-Handle-Mallet-Wood-Mallet-Snap-Rare-Vintage-Item-/150774157093
Has a clear SO logo on it.
Not that it means much, but I've received a wooden mallet before (in the early 90s) as part of a very large Craftsman mechanical tool set.