I've got two boats here that the year don't match the title, my 1964 Duratech title reads 1984, which is the year which it was brought to NJ, and titled here. Since the brand wasn't on their 'list', they called it a "Homemade 1984"
I bought a 2007 14' Seafarer in PA, from a former South Carolina resident, with no title, just a notarized bill of sale, which they didn't view it as a valid proof of ownership, I then had to have it inspected by the state and go through all sorts of BS and they finally granted me a title, which they said was for a 1973 14SF. The hull number clearly states the model and year, but the inspector called it a 1973 because he thought it looked like his old 1973. There was no arguing with the guy. He said if he calls it a 1973, then its a 1973. I took it as every boat he inspected got titled as a 1973 model. I didn't much care since it gave me a title with a matching hull number on it. My guess is that by now they've probably registered more 1973 models here than were ever made in the first place that year.
I currently own a 1970 Seafarer, its been in my family since new, it has one center knee brace and the transom is only 54" wide.
Personally I prefer the later single brace transom support design because the single brace connects the transom wood panel area to the first rib, where as on the triple brace system, each brace is only attached to the outer skin of the hull not any internal structure. There are also more rivets along both sides of the single brace on those hulls than on the triple brace models.
Over the years, I've seen a few boats with the braces pulled free of the floor or rivets pulled through from running with either too much power or rotted transom wood.
I've also seen a few single transom braces missing upper corners but that comes from interference with smaller motor clamps clamping down on the top two bolts.
Anything smaller than a 10hp usually has this problem.