That is a 28" frame Continental, which was produced only in '82 and '83. What is the small 4-digit number stamped in the headbadge? That will identify the day the bike was built.
Note that the 28" frame Continentals had hand-built fillet-brazed frames, which (besides the huge size) makes them somewhat unique. Here is a pic of a 28" Continental frame with the paint removed where you can clearly see the brass fillets:
