I have 'Hishou Same' (the Japanese version of Sky Shark)...are you interested? It's not as though there's a lot of reading involved...it's just the title screen and credits iirc...
i have two non working sky sharks if you want to tinker.. the one did have sprite issues (couldnt see the plane) and the audio worked (until i removed the sound amp). the other doesnt do much. $10 plus shipping for both