How does anyone really know if the "only other time" was in 1933? There were no hurricane hunters, no satellites and, no data collection buoys scattered around the earth. Record keeping was based upon what was seen by human eyes and therefore if someone didn't see it, then it could not exist.
valid point, which by corrolary means if that many storms were sighted in 1933, there may have been a LOT more in the bermuda track or otherwise not noted.