Agreed, it's circa 1983-1984 and appears to be Miyata sourced. The serial number will corroborate the year and manufacturer. I'm not surprised at the failure to sell at $250. Most buyers doe not want a project bicycle and the project buyers typically want just a frame, so they build their own vision with minimal expenditure. This one has obviously been frankenbiked to an extent, based on the Modolo levers. The Aerox crankset and distinctive AGC300 brakes are correct but I'm not sure about the derailleurs. I typically see this model with Superbe Pro. The Cyclone equipped model during this era was typically the Gran Premio.
I don't have any 1983-1984 prices for the Competezione but I'd estimate $550-$600, given that the one step lower Gran Premio sold for $470 and $520 in 1983 & 1984, respectively. I'd say that you got a good but not not great deal, once you factor in the $100 shipping cost.