Vintage union made Burberry blazer

Vintage union made Burberry blazer. Great condition. Only damage to note is slight stitching coming undone at the split tail lining. Originally buttons and no stains or holes. Dark blue with beige and ever so slight burgundy. No size tag so please review measurements. Approximately a modern day US 51L. Armpit to armpit: 25.5” Length: 35” Shoulders: 21” Shoulder seam to bottom sleeve: 26.5”