Vintage Keuffel & Esser (K&E) Paragon Engineers' Triangular Scale model 1631P crafted in the USA. This professional-grade drafting tool features a white finish with clear black markings and a distinctive orange-toned core. It comes housed in its original green protective case, which shows vintage wear consistent with age and use. Ideal for collectors of engineering memorabilia, architects, or drafting enthusiasts looking for a classic piece of American-made precision equipment.