Thank you for submitting your item for appraisal. This appears to be an early 20th collotype print after the drawing by Michelangelo, the portrait of Vittoria Colonna (c.1491-1547). The collotype or Lichtdruck printing technique was invented in the late 19th century and became very popular all over Europe. A number of Museums, e.g. the Albertina in Vienna or the British Museum issued large numbers of colloptype reproduction prints, which are often mistaken to be genuine drawings. The print in your possession was intended for home decor, the original can be viewed in the British Museum. The estimate is based on similar prints sold at auction ( if correctly described ).