The detriment caused by the breach of a warranty of an agent’s authority is deemed to be the amount which could have been recovered and collected from his principal if the warranty had been complied with, and the reasonable expenses of legal proceedings taken, in good faith, to enforce the act of the agent against his principal.

Source: CivC 1877, § 1965; CL 1887, § 4598; RCivC 1903, § 2310; RC 1919, § 1982; SDC 1939 & Supp 1960, § 37.1809.