I beleive this early Starfleet vessel made its first brief appearance in the Enterprise Season 2 closer “The Expanse“. It then popped up a couple of times later in the series. It’s class type was never really named, nor any of its capabilities. What little we know is that it does pre-date the NX Class. It has been referred to as the Wapr Delta Vessel. Here are some Color renderings from The Drex Files.