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ST. HELENA -- The oldest and largest exhibit in Napa County is likely a 66 million-year-old Tyrannosaurus rex skeleton named “Roosevelt.”

“Rosie” is mounted on a steel frame at the Erin Martin Design showroom, 1350 Main St. The skeleton is some 35 feet long, 14 feet high and 9 feet wide. It dominates the gallery space.

A VIP reception for the T-rex was held in late June. After that, Whitney Andreae, showroom manager, said the movement of people to see the skeleton has been building. “It started off slowly but people have been hearing about it, bringing their kids in. It’s been pretty fascinating.”

To prepare for the exhibit, the showroom, was closed for two weeks in June and the windows were covered with paper. The T-rex skeleton was brought to the gallery in crates. A team of three or four people assembled Roosevelt in an hour or two, Andreae said. Roosevelt is owned by Theropoda Exp. LLC, a commercial paleontological company based in Texas.

Andreae said Erin Martin ran into the collector, who was looking for an exhibit space. To bring it to St. Helena was an easy decision, “because it’s so fascinating,” Andreae said. She added it will be displayed in the showroom through the end of August or maybe September. It is for sale for $3.9 million.