Gameboy Advance. It's showing its age, there is a scuff on the screen. Model No AGB-001.On 19-May-24 at 07:20:46 BST, seller added the following information:
No rust in the battery compartment, just some oxidation. Game loads and all buttons appear to work. Looking more closely there is a scuff and a scratch on the screen, the scratch can be seen on the second photo.