What does "Messrs" mean? Is it an old English, perhaps?

Native speaker’s answer
Rebecca
Yeah, I'd say it is old English! It's a formal title used when referring to more than one person in a company. Here "Messrs" is the title for all the names listed. Ex: Messrs Smith and Newsworthy are coming to the business meeting. Ex: The job was done by Messrs Rick & Shaw of Newton.