"One page" is going to have to be a misnomer when it comes to the character sheet. Although I guess the actual character stuff all fits on one page, with the rest being information about possessions, associates, gold and experience that can go on ... not a character sheet, but an inventory ... yeah, that's the ticket.
Unfortunately Blogger has gone messing with their code again, so clicking a picture reveals the unbearable transparency of the source image...fixed now.
OSR: Boss Fight: The Blizzard Eel
39 minutes ago