Someone may have converted it to a long shaft. Dealers commonly did that if they didn’t have a long shaft in stock and had a buyer. Does it have an extra 5 inches of exhaust housing bolted on above the lower unit gearcase? If it is short shaft, it should measure about 18 inches from where the clamps sit on the top of the transom to the cavitation plate. Long shaft will measure 23 inches.
Look again at your model number – it has a typo – should be 5 numbers and may or may not have a letter behind it.
See long shaft below:
