RARE ITEM! VINTAGE 1975 Varsity Letterman Blue Cardigan from Sand Knit Size 40. RARE! Vintage varsity letterman cardigan sweater class of 1975. It features a royal blue heavy knit body, classic large button-down front closures, low-slung patch pockets, and a stitched yellow-and-blue chenille letter "C" patch on the left side, and chenille number "75". Sand-Knit Division Mentalist Industries was prominent manufacturers of these durable, high-quality athletic garments for high schools and colleges during this era.