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I've done a bit of research around the early frames and I have read that the early frames between 80' and 81' had the Eddy Merckx BB shell which this frame has. The early BB serial numbers don't always appear to follow any sequence and this frames numbers are different to any other professional that I've seen online.
There are three different numbers -
3,515 & 879 and no letters which can be found on Merckx BBs.
The 3 & 879 are also on the fork tube.
Some Professional have different shells and some have no serial numbers at all.
SideshowBob
@HillyBen
Have you looked into whether this is De Rosa built? The serial number would have to be low