Victoria Royal Vintage Silk Beaded Black Evening Formal Long Evening Gown Dress

Very great condition. I can’t find any flaws. From my research I believe this gown to be from the 60’s or 70’s. No size listed. I would say it’s a M. Please see measurements. Adorned in beaded embellishments. High slit at the back of the legs (see last pic). Top of shoulder to hem is approximately 57” Armpit is approximately 21.5” laying flat