A 19th-century cannon that had fallen into disrepair as it sat outside the Quinn Building on Hampshire Street for several decades in Methuen has received a necessary refurbishment and will be unveiled Thursday, the Methuen Historical Society said.

After concerns arose about the cannon’s deteriorating state — the wooden wheels had rotted and its barrel was pitted, becoming green and moldy — the restoration project was undertaken by students at the Greater Lawrence Technical School in Andover, with support from the mayor as well as the historical society, said Denis Webster-Greene, president of the Methuen Historical Society.