Vintage oversize birch blackboard ruler 150cmVintage oversize birch blackboard ruler 150cm. Traditional blackboard ruler made from birch and used for blackboard teaching.WORKSHOP REPORTOur workshop team inspect every product and carry out any needed repairs to ensure that everything leaves us serviced and maintained ready for many more years of life. All of our vintage products show the rich beauty and history of their life with the knocks and bumps of many years of use and we try to minimise restoration to keep every piece as original as possible.