Ribbed retro style collared zipper top

Adorable 70s (?) style shirt with half sleeves brass zipper. Material is an off-white ribbed blend of 66% lyocell, 32% cotton, 2% elastane. In excellent used condition, no flaws or signs of wear. The material has some weight to it, but it’s still slightly sheer somehow (magic?!). Label says US 12, looks like medium or a smallish-large.