The phrase “1877 Salford by-election” appears to refer to a parliamentary by‑election that would have taken place in the Salford constituency of the United Kingdom in the year 1877. However, reliable encyclopedic sources do not provide detailed, verifiable information about this event, such as the precise date, the cause of the vacancy, the candidates who stood, or the election outcome.
Because the available evidence is insufficient to construct a comprehensive, fact‑checked entry, the term is not widely documented in standard reference works. Consequently, any further discussion would be speculative. The phrase may be used in historical contexts relating to 19th‑century British politics, specifically concerning electoral contests in Salford, but concrete details remain unverified.