This is an aluminum Sierra Club Sierra Cup. I bought it on an online auction a long time ago, but I never used it because I thought it was too precious. Sometimes I want to use it, so I wash it, but I can't bring myself to use it. I'm decluttering and want it to go to someone who will use it, so I'm letting it go. It shows signs of use. Please note that I may have overlooked something during my amateur inspection. Please purchase only if you understand.