It was originally launched as a form of capital ship, I think the nearest comparison would be the German pocket battleships of WWII.I am not sure if that is true. USS Constitution has always been listed as a frigate but has guns on both the the gun deck and the spar deck.
A great ship to visit if any of you are in Boston. My then wife was attached to Constitution '79-'81 as a public affairs officer, reporting to the CO of Constitution but not ships company. I spent some time on board back then when I would pick her up from work. I would go to the quarterdeck and the watch would call her and say I was there. On a few occasions she would say she needed 20-30 minutes to finish something and I would go down to the orlop deck which is not open to the public and have a coffee. Above that is all historical but the orlop deck is home to the 12 man duty section that sleeps on board and has navy bunks, coffee machine, TV, microwave etc.
I recall my wife was promoted to Lieutenant on board Constitution. It was her first day with two stripes and her first day in maternity uniform. She left active duty about a month before our son was born, stayed USNR for her 20 years.