Vintage MJ Concepts in Sportswear navy blazer

Vintage MJ Concepts in Sportswear navy blue blazer, likely from the 1960s or 1970s. Marked size 11, but see measurements as vintage sizing is different. It’s in great vintage condition. Measurements are approximate and taken flat while blazer is buttoned: Pit to pit- 18” Waist- 16” Sleeve length from shoulder seam- 23” Length from shoulder to hem- 25”