A real beauty , below all that dust it looks great. And black ones are few and far between. Congrats on finding your dream bike.
I can't read the serial number on the seat tube, up near the seat cluster. But look here and see where it falls in the date scheme.
Frejus serial number chart
I agree. With the Record brakes and other gear on it, it looks to be their high end model. Professional or Super Corsa, I would guess. Of course, parts could have been switched out, but those look quite original to me.
What is the date on the top of the rear derailleur? Also, the date on the lock nuts on the hubs will give you an approximate. As will the date codes on the back of the crank arms.
Nice! Black is so cool!