This beautifully made black 3/4 length sleeve, peplum blazer has no tag except for half of a union label. The linen is a woven, feels like a linen, perhaps a blend? Buttons are faceted. Front pockets that are hidden in the peplum (see photo that has sleeves in pocket). Any thoughts on era or maker? My art historian background makes me want to know every detail about every vintage piece I own Union label was used from 1938-1964.