True vintage 70s Gettysburg war military long sleeve graphic tee t-shirt retro

True vintage, long-sleeved sportwear-cut "Gettysburg" tee, featuring a soldier and a cannon. Item's age is estimated to be 1970s, possibly older.  Graphic is in good condition for its age! Item has inside neck tag but writing is worn off. Item has sewn-on tag on wearer's left bottom hem: "L," "WPL 7190" and "Made in USA".  Material unknown, feels like cotton.  Pit-to-pit approximately 19", top of shoulder to bottom hem approximately 28". Measurements are approximate, and this is being sold as a listed L. As this is a vintage item, please size down if unsure.