This vintage slide ruler is a must-have for any engineering or surveying enthusiast. The architect Colas Hope no. 57 has a unique retro design that is sure to catch the eye of collectors. It comes with a plastic case for easy storage and protection. The ruler is a great addition to any scientific collectables collection and is manufactured in the United Kingdom. Notably, the ruler is from the period between 1901 to 1950 and has not been modified. Add this classic item to your collection today!