Vintage 70's 80's men's M/L light blue long sleeve button shirt by Big Mac

Vintage 70's 80's men's M/L light blue long sleeve button shirt! By Big Mac. No marked size so please see measurementsm Has collar. Two front button pockets. Sleeve ends button. There is a pin hole in one sleeve and a faint spot on back tail. I may try to wash again and scrub. Overall good vintage condition. Happy to answer any questions :) Measurements: Pit to pit - 22 1/2 inches across. Length from shoulder to hem - 29 inches. About 25 inches on the sides. Shoulder seam to shoulder seam - 18 inches across. Sleeve length from shoulder seam - 23 1/2 inches. Sleeve length from armpit - 21 inches.