Classic Muscle Cars 2016 Wall Calendar (12x12) Featuring the Photography of Paul Sontrop Classic Muscle Cars 2016 wall calendar with classic square format. This amazing calendar features the the Photography of Paul Sontrop. Large grids to mark appointments and events. Observes major holidays and moon phases. Measures 12 x 12 closed, 12 x 24 opened. This square 18-month wall calendar includes 13 stunning images with large grids.