Ronald Read, who died in June 2014 at 92, amassed his secret fortune with stock picks, a small wardrobe and decades of savvy parking

A Vermont man who sometimes held his coat together with safety pins and had a long-time habit of foraging for firewood also had a hidden talent for picking stocks – a talent that became public after his death, when he bequeathed $6m to his local library and hospital.

The investments made by Ronald Read, a former gas station employee and janitor who died last June at age 92, “grew substantially” over the years, said his attorney Laurie Rowell.

Read, who was known for his flannel jacket and baseball cap, gave no hint of the size of his fortune.

“He was unbelievably frugal,” Rowell said Wednesday. When Read visited her office, “sometimes he parked so far away so he wouldn’t have to pay the meter.”

The bequest of $4.8m to the Brattleboro Memorial Hospital and $1.2m to the town’s Brooks Memorial Library were the largest each institution has ever received. Read also made a number of smaller bequests.

“It’s pretty incredible. This is not something that happens on a regular basis,” said the hospital’s development director, Gina Pattison.

In addition to cash, he had an antique Edison phonograph with dozens of recording drums, which he left to the Dummerston Historical Society, Rowell said.

“It’s really a beautiful machine,” said Historical Society’s president, Muriel Taylor.

Read was born in Dummerston in 1921. He was the first in his family to graduate from high school, walking and hitchhiking about four miles each way from his home to the campus in Brattleboro. After military service during the second world war, he returned to Brattleboro, where he worked at a service station for 25 years and then as a janitor at the local JC Penney for 17 years.

In 1960 he married a woman he met at the service station. She died in 1970.

Stepson Phillip Brown, of Somersworth, New Hampshire, told the Brattleboro Reformer he visited Read every few months, more often as Read’s health declined. The only indication Brown had of Read’s investments was his regular reading of the Wall Street Journal.

“I was tremendously surprised,” Brown said of Read’s hidden wealth. “He was a hard worker, but I don’t think anybody had an idea that he was a multimillionaire.”