Archon class

The Archon-class was a type of cruiser in service beginning shortly after the founding of the in 2161. Similar in appearance to the ships of the Earth Starfleet that were later integrated into the Federation Starfleet, the Archon class was larger.

The prototype of this class was constructed from the spaceframe of what would have been the USS.

USS was a structural test ship made from an Archon-class spaceframe, hence the low registration number in comparison with most other vessels of the Constitution class. (Enterprise Evolution Plans)