Vintage Gettysburg PA Ringer T Shirt by Diamond

Here is a super cool vintage t-shirt from the 70s by Diamond. It's 50/50 polyester and  cotton, and made in the USA. Light blue shirt with dark blue accents and awesome graphic on the front. It's in amazing condition with years of life left! This one is thin, light weight, sheer, buttery soft and comfy. There are two small, light discolorations on the front that I think might come out with some effort. The shirt itself s in amazing condition with tons of life left. The tag says Medium, but here are the measurements taken laying flat. (refer to the last pic above to see how I measure shirts)

Chest (armpit to armpit) 17"
Shoulder to end of sleeve (including cuff) 7"
Length 26"