Springfield residents and motorists on I-91 will soon see the full name and logo of Wellfleet, a Berkshire Hathaway insurance company, prominently displayed on the city’s skyline. Signage installation began last week on the western side of the 28-story Tower Square office building at 1500 Main St., at the center of Springfield’s downtown business district. Agnoli Sign Co. of Springfield is responsible for planning, fabricating, and the complex installation of Wellfleet’s name and logo about 300 feet in the air. Wellfleet relocated its corporate headquarters to Tower Square in 2019, occupying 80,000 square feet within three floors. Wellfleet has about 210 employees, with the majority based at the Tower Square office.