Vintage 1990 Rotiskenhrakete Native Warrior Flag Tee

Amazing vintage black single stitch tee with Rotiskenhrakete flag graphic. Has a small signature in corner of graphic dated 1990. Graphic shows some wear, shirt has light piling, right shoulder has a weird loop in the seam - see photos for details. Tag has completely faded with fabric, maker and washing instructions, would say it fits as a large or extra large. Measures 21" across shoulders, 22" pit to pit, 29" long.