Vtg BIG MAC Shirt Mens L Blue Chambray Embroidered Native Petroglyphs USA Made

Really cool vintage, south western style shirt by Big Mac, made in the USA. Blue chambray material with button front closure, long sleeves, chest pockets and hand embroidered artwork. Embroidery appears to be Native American petroglyph designs. Has figures and symbols embroidered on both the front and the back. 

This shirt looks really good, but does have a couple minor flaws: 
Men's size Large (16-16.5)

Measurements laying flat: 

Chest: 23.5"
Length: 31"
Shoulder: 20"
Sleeve: 24"