This industrial modern art watch display was created using a 1940's WWII Jacobs R-755 (or often called the L-4) radial engine piston. The R-755 was used during World War II and powered airplanes including the Avro Anson, Cessna T-50, Avro Cadet, Anahuac Tauro, Cessna AT-17, Cessna 195, Funk F-23, Grumman Ag Cat, Kellett KD-1, Morane-Saulnier MS-505, Waco CG-15, Waco YKC, YKC-S, YKS-6, Boeing Stearman 75 and the Beechcraft Staggerwing.MADE IN THE USA! A PLANE PIECES INC ORIGINAL DESIGN!MODERN DESIGNLIMITED TO ONLY 100 PIECES WORLDWIDEPiston has been high polished by hand to a mirror finishFlying Monkey Stamp for AuthenticityPiston Measures approximately 5 inches in Diameter X 3 Inches HighComes complete with watch stand and adapter. All you need is your favorite watch to show off.LIMITED TO 100 PIECES ( Hand Numbered on bottom).