Jim Harriott found the early Roman coffin in the 1980s.
A Roman coffin, two Bronze Age swords and a human skull have been donated to Reading Museum by a construction company.
The objects have been on loan since the 1980s but were formally donated by Cemex UK on Friday.
A quarry worker originally found the coffin in South Reading in 1982.
The hollow wooden coffin contained the body of woman in her 50s and was radio carbon dated to the early Roman period of 50-150AD.
Jill Greenaway, curator at Reading Museum, described the new acquisitions.
"It's quite an unusual coffin. It's a hollow tree trunk," she said.
"We're not sure if the coffin was buried in earth or left in water."
Mrs Greenaway said that originally the coffin was thought to date back to the Iron Age, due to the style of burial.
Archaeologists were then interested to discover the coffin was early Roman.
In addition, Bronze Age swords and a skull from Wraysbury near Windsor have also been donated to Reading Museum.
Mrs Greenaway said: "They are absolutely beautiful items, leaf shaped and beautifully balanced.
"The handles are very small, which shows that the people who used them had small hands.
"We are thrilled that Cemex has decided to donate these items to the museum."