Antique Slater authentic Brothers Multi-Blade Penknife

authentic Antique Slater Brothers Multi-Blade Penknife. I would date this knife to the late 19th century. It measures 9cm x 28mm x 14mm It measures 16cm when open. It weighs 91 grammes. It reads "Slater Brothers Sheffield. There is a minor split to fron scale. The front engraving plate is also lifting. The knife could do with a good clean.