Antique English Optometrist Trails Set

Complete early 20th century English Optometrist Eye Glasses trials set by The Medical Supply Association London.Very interesting and rare piece with all its original contents bar one lense.The set hold approximately 120 individual lenses.This would have been used by a travelling optician to make order individuals glasses .The set is in remarkable condition apart from one cracked lense and two lenses with the retaining screw missing for which replacements could easily be obtained .But overall a fantastic piece of medical history.The box is 46x26cm and 7.5cm high.I can post for €20 registered post.Thanks