I always thought the most frequently observed barrel was 7.5 but I don't know for sure. I think it is still true that the term "Navy" refers not to the model (of which the 6.5 inch barrel might be peculiar) but to the caliber.
I would say that 225.00 is quite a good price for that pistol. Because of the rarity, I think a quick decision (not always a wise option) might be in order. If this piece is up for public sale, it might go quick.
My reading of history convinces me that most bad government results from too much government. Thomas Jefferson