Text on the reverse side: With earliest models dating back to the 2ndC, armillary spheres are brass representations of the celestial sphere with either the earth or sun at the centre. Sailors often used armillary spheres for navigation on their voyages as they traversed the sea. * Size (55mm x 180mm) * Luxury pearlescent eco-certified paper * Produced in our London studio * Trivia fact on the reverse * GS1 barcode for POS