Sherlock's 7 Cent Solution (The Obscuriosity Series: #2) by Diamond Jim Tyler - Trick

This is a nice wooden puzzle is custom designed. It measures 3.75 x 3.75 inches and fits into the palm of your hand. The seven pennies are included. The object is to start on a vacant circle and to move it once along a connecting line to another empty circle. This must be done with all seven pennies leaving the eighth hole vacant. Most people can do four or five pennies, but doing all seven takes a knack. This makes a great gift. Limited supply.