This newspaper article about the race is from the Eugene Register-Guard - July 9, 1973.
T-Shirt Product Specifications;
*Made in U.S.A.
*Oddly, imprint is off-center.
*From logo to right armpit is 3.5-3.75”.
*From logo to left armpit is 5.0”.
*Red and blue on white
*blue on white with red collar
*Sportswear
*WPL 7232
*L (42-44)
*100% cotton