Very durable and can be used outdoors. These are not cheap tin. We create the signs to look like originals from the era and hand age them to give them that barn find look. We have a process that makes real rust so the aging is real and not paint.
We are not professional appraisers and we do not claim to be. There is no way for us to know that. Unless marked, exact age is unknown, only guessed. We try our best to use great lighting when taking our photos so that you will have a VERY accurate view of the exact item you will receive.