The Sarajevo-type starship was a class of warp driven vessel utilized by Earth during the mid-22nd century.
A vessel of this class was among the fleet that greeted and escorted Enterprise back to Earth following the Xindi incident in 2154. (ENT: "Storm Front, Part II")
The Sarajevo, another vessel of this class, was used as a transport back to Earth later that year. (ENT: "Daedalus")
Background
John Eaves' sketch for this ship referred to it as an Earth Starfleet "Elite Observation Vessel." According to Rob Bonchune, "The sketch seems more detailed as it has a Starfleet registry NC-27 on the side and has red bussards towards the front/side in front of the blue warp glow," that were apparently not added to the CGI model. [1] According to Eaves "a stack of horseshoes on my desk was the visual inspiration behind the design." [2]