Vintage Antique Drafting Protractor

Vintage Antique Drafting Protractor made by Keuffel & Esser CO NY in original case. There is a cut on the case but case is still in working condition. Pet friendly and smoke free home but the case does smell as though it’s been stored in a basement. The actual protractor could use a polishing but I don’t want to risk damaging it. Feel free to ask any questions:)