Mariner 25 HP twin

Hi have just bought this engine and need to buy manuals and other bits but cant identify the serial number on any site yet found after several days of looking. Its 0P082755 its on the serial plate as well as the core welch plug, can anyone help. I am a bit new to this, been sailing and kayaking for years but have just bought a 4 mtr inflatable so need to start learning all over again. I intend keeping it well serviced at a local agent in Brighton area but would like to now as much about it as possible anyway. Any help appreciated please. AlanD