u/EmotionArtistic8030

hi everyone ! First time on Reddit hoping someone can help me !

I recently bought this old clock radio and been having some trouble setting the clock. the radio works fine, however the clock keeps blinking and resets to 00:00, and no matter what button I press/hold down it doesn‘t do anything

I‘ve tried looking around online for a manual or something similar but it seems it’s from a time before the internet and any search has come up bust :[

I tried to open it up but the screws are all stuck and/or broken, so I’m scared of breaking anything by being any more forceful

Does anyone know how to set it or if it’s even worth to take to a professional to take apart ?