Algebra Watch

For the puzzle or math lover in your life.  A great gift for teachers and with Christmas season approaching it makes sense to buy before the time crunch of the season.  Instead of the usual 1-12 numbers on the face there are algebraic equations which, when calculated equal the hours of the day.  The leatherette strap has a buckle closure.  There are silver numbers and hands, including a second hand.  

It arrives in a lovely black circular gift box.