Purchased from an old line Honda dealer who stocked lots of OEM and high quality replacement parts in the heyday of Japanese imports but is now closed. NOS Items may have shelf wear, metal items may have slight corrosion, but pictures taken from all angles and you can ask questions about condition before purchase.
I believe it to be a Honda CB500T, the original color from looking at the bottom looks like the Glory Brown Metallic color of the CB500T, but no guarantees. Look at the dimensional pictures to make sure it fits your application. Its a large tank, and could be used as a Bobber. The tank has surface rust and at some point some body work was attempted. It is however in very nice condition overall with no rust areas on the bottom. It has a shallow depression pointed out in one of the pictures.