Police are trying to trace the victim, thought to be in her 80s or 90s, after the attempted robbery in Mount Road, Penn, on November 10.
Wolverhampton Police posted on Facebook saying: "Can you help our enquiries into the attempted robbery of an elderly woman in Mount Road, Penn, Wolverhampton, at about midday on Tuesday 10 November?
"It is understood a woman tried to rob the pensioner, thought to be in her 80s or 90s, but a kind-hearted builder stepped in and stopped anything from being taken.
"Our enquiries are ongoing but we need to find the elderly victim, who was white and believed to live locally, so she can help with our investigation.
"Anyone who knows who the victim may be, or has any information about the incident, can contact us via live chat at www.west-midlands.police.uk or by calling 101. Please quote crime number 20WV/276245J/20."