If the transom is original, and there's not a hull ID number cast into the upper starboard side of the transom, it's a '72 or earlier. If it's a '72 20 CC, it's the SuperFisherman model. The only other 20 CC is the Master Angler, and it didn't go into production until '75. I believe the "FOB" in your serial number stands for "fisherman outboard". If it was an I/O, the SN would start "FIO..."
Dave
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Blue Heron Boat Works
Reinventing the wheel, one spoke at a time.
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