Because of the conventional seatpost clamp it has, I suspect it's an early 80's re-branded Vitus 979 frame. Later 979's had the grub screw seatpost clamp that was Vitus' solution for the cracking seatpost clamp problems that they had with the earlier 979s.
The frame will have moderate value, as there were literally thosands of 979s made and sold and a lot of them are still on the road. Maybe 250 -300 bucks max for a frame in m mint condition, but there's so many 979s in the market that a more realistic value might be around $200, if you want it sold in reasonable time.