Hexagonal ring. There are no distortions. Engraving: There appears to be a number before 25, but it is unclear. Perhaps a 9? See the second photo. It did not stick to a handheld magnet. See the third photo. Please understand that this item has not been professionally appraised. Please forgive any minor oversights as this is a personal inspection. I will wrap it in bubble wrap and ship it. Available for immediate purchase.