The oversize backs are engraved: 925. The posts and backs are very comfortable and hold firmly. They have been very well cared for. These wonderful earrings are from a local estate of fine jewelry that I will be listing this week. This item is in the category "Jewelry & Watches\Vintage & Antique Jewelry\Earrings".The seller is "acarlover1" and is located in this country: US. This item can be shipped worldwide.