This is not common and some pictures might help. Mistakes obviously happened but it seems unlikely that no one else would have noticed this error before it left the factory. Does the bow deck have any signs of having had a dealer logo (i.e. a shadow, discoloration, nail holes from a brass tag, etc.)? Are the inside rails original and are there any signs that the seats may have been moved or reversed at some point? Are both decks original or could they have been reversed in a prior restoration or repair? Is the decal correct for this period or does it appear to have been added later? What is the serial number and does the build record indicate anything unusual?
Benson