Portsmith class

The Portsmith-class was a type of Federation starship entering service in the mid-23rd century, classified as a destroyer or escort vessel. (Star Trek Spaceflight Chronology)

Service Life
The Portsmith-class was first commissioned in 2194 SFC (which corresponds to the early 2250s in the standard timeline), and remained in service at least through the 2270s (likely longer, in some capacity).