Most high end Italian frames from the 80s are going to use Campagnolo semi horizontal dropouts I believe. If not then that would be at least a warning sign to look closer.
Many, such as my early 80's Colnago, also have distinctively marked parts such as the Colnago engraved name on my seat stays and the "club" card symbol engraving on the fork and bottom bracket cutout.
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Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
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http://groups.yahoo.com/group/Geared_hub_bikes/