The Jaguar 420, produced between 1966 and 1968, represents a distinguished entry in the luxury saloon segment of the late 1960s British automotive market. As a derivative of the larger 420G, it embodies Jaguar's core philosophy of "Grace, Space, Pace," offering elegant styling, a powerful 4.2-liter XK Straight-Six engine, and a comfortable ride. This model was engineered with a focus on performance and traditional luxury appointments, featuring independent front and rear suspension systems, a hallmark of Jaguar's commitment to superior handling and ride quality. Its design was intended to provide a more compact yet agile alternative to larger saloons, competing with esteemed marques of the era.

This comprehensive Spare Parts Catalogue, written in English and presented in a bound volume format, serves as an essential resource for owners, mechanics, and technicians. It provides detailed, illustration-based identification and listing of all factory-supplied parts, covering every major assembly and sub-assembly. Areas of coverage include engine components, transmission and drivetrain, chassis, suspension, steering, brakes, bodywork (interior and exterior), and the electrical system. The manual also includes information on part supersession, facilitating accurate ordering for repairs and restoration. Its estimated 200-300 pages are designed to offer in-depth technical detail, ensuring the continued maintenance and longevity of the Jaguar 420.