Vintage 2036 silver tone key. Don't know exactly what kind of key this is, see photos. Size is approximately 3/4" wide x 1 1/4" long and the opening of key is 1/4" wide outside and 3/16" inside. 

Please see photos for condition. Any questions, please ask. Home is smoke free. I will combine shipping if you want to buy any of my other items for sale on ebay!