Old 04-05-16, 03:54 PM
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Shimano 600 Ultegra would date it no earlier than 1988 but this appears to have been cobbled together based on the pedals and Camapagnolo Gran Sport brakes. I can't identify the crankset from the pictures.

It may be a repaint with added decal but appears to be a decent frame based of the investment cast seat lug and front derailleur tab. I place it circa 1982-1985 based on the lack of a 2nd set of bottle bosses and pump peg. The rear dropouts look like they may be Columbus. As stated by juvela, the brake bridge is a common cast design.

Lack of embossing suggests a smaller builder but we should be able to narrow down the nationality, tubeset and grade. The bottom bracket cups will have the thread standard stamped on them, which will allow to narrow down the nationality. The seat post diameter will tell us the grade of the tubeset. Remove the front wheel and check for five helical ridges inside the bottom of the fork's steerer tube. This is indicative of Columbus tubing. If nothing, remove the fork and check the steerer. Most manufacturer's stamp their name or logo on the steerer and some even date code them. Anything serial number on the frame?
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