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Armstrong-type starship, USS Armstrong
The Armstrong-type was a type of starship used by Starfleet in the mid-23rd century in the alternate reality.
A typical ship of this type had two outboard nacelles and an inboard nacelle. These nacelles were connected by swept pylons to the underside of the primary hull. Similar to the Miranda-class starship in the regular reality, a Armstrong-type starship was equipped with a rollbar supporting a multi-tube torpedo launcher. Extending from the trailing edge of the primary hull, and connected to the rollbar by smaller pylons, there was a structure housing the impulse drive. This type participated in the pivotal Battle of Vulcan in 2258, and was named after the USS Armstrong. (Star Trek)
USS Excelsior (NCC-1729) (USS Excelsior (alternate reality) at Memory Beta, the wiki for licensed Star Trek works) is depicted in concept art from Star Trek - The Art of the Film as a brown colored ship of this class. According to the novelization of the film, the Excelsior also participated in the Battle of Vulcan.