What year is your mercury red band 40 hp ogo47555?

The Mercury Red Band 40 HP outboard motor with the serial number OGO47555 was likely produced in the late 1970s to early 1980s. Mercury's serial number system can help narrow down the exact year, but typically, motors from that era can be dated using the last digits of the serial number in conjunction with manufacturer records. For precise information, you may want to consult a Mercury dealer or reference their vintage motor guides.