Vintage Grand Slam Munsingwear Penguin Polo Shirt

Wow, what an awesomely retro, vintage Penguin polo! Looks like it's from the 60's or 70's. It has kind of an abstract floral pattern. 100% polyester. Made in the USA. This vintage polo is in great condition. There is minor staining in the inside collar, but this is difficult to see (look at third photo). Otherwise, this is in mint condition. It's tagged a men's size Medium, and measures 20" across the chest, between the armpits.