The Vin # will help.
American Honda didn't offer a 74 CB500, that was the 550 year introduction.
On the front of the cylinder block will be a casting number stater 498cc for the 500 or 544cc for the 550. That is just one tell-tale.
The title may be marked on the day issued, and have no relevance to the model year from Honda. 73 Hondas were also sold in the year 1974.
There can also be engine transplants, so the engine number is just as important as the Vin # in identifying what you have.
If you want to look it up yourself, I think the numbers are all posted somewhere on this site.