This shirt is of a patent issued in 1949 to Tree Tool & Die Works of Racine, WI for a Universal Milling Head. Tree mills were workhorses, and many people prefer them over the popular Bridgeports.
Your typical 100% cotton machinist t-shirt (except for heather colors, which contain 10% polyester). Pre-shrunk to make sure your size is maintained throughout several washes, and a classic fit.
• 100% jersey knit
• Seamless, double-need ⅞” collar
• Taped neck and shoulders
• Classic fit