In-depth forensic investigation and analysis of historic vehicles is a relatively new field of research. However, such examinations are becoming an important tool in the face of rising market values and the associated increase of manipulations and forgeries. We review various forensic approaches used in our interdisciplinary work in this field, including vehicle specialists, metallurgists, restorers, and archaeometry laboratories. The related investigations cover a general examination of the vehicle including detailed analysis of its materials and construction techniques, which are cross-referenced with the techniques and materials used in period. We illustrate our theoretical and analytical approach with practical examples from our work on collector vehicles. Finally, we consider methods and approaches currently under development.