Oh, there's lots of room for something like that. The real issue is that the Mk 39 was reported to be the most-produced version of a line of ships that was in production for 200+ years, and the current version as of 2750. So it appearing in FedSuns service in 2577, when the design is barely a third of the way through its life-cycle, is a bit of an issue. After all, in Clan service it gets three new updates (to the Mk 42) in the space of about 175 years, but if the Mk 39 version is available in 2577, and still the "new" design in 2750 after 175 years...well, that doesn't make sense.
Thus in 2577, if it's in service with the Great House the Vincent should be in a much earlier edition, something between Mk 10 and Mk 20, say, especially since even the Mk 39 is less well armed than one of the designs it replaced (the Vigiliant) despite being nearly twice the size.