The listing, Vintage 30s Gold Tone Medallion Metal Belt Buckle On Card has ended.
My best guess is 1930s (maybe a bit earlier?, not an expert so take a close look at photos)
On original card "Specialties Buckle, Para-Spec-Co. Product"
2 piece belt buckle
Gold tone metal shows some tarnishing, however it appears unused
Measures 4" completely across and 2" high
Great crafting supply, create your own belt, add to your vintage inspired dress