Brass and moroccan leather French mariner's compass. Schooner three draw, 18x mariner eyeglass. By drawing the scope longer or shorter the right focus is obtained. Works perfectly, lens in perfect condition. It measures six inches closed and 17.25 extended. Please see the details as to how the lens can be closed or opened. There is a small pin at the top and by moving it from side to side toe lens is opened and closed. This eyeglass has been well used.
Thank you for looking and any questions, please do not hesitate to ask.