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The headset does look like the 1050 from your link, and the brake levers match too, but the brakes are 105 dual-pivots. When did 105 go dual-pivot?
No idea, but Campag introduced them in '94, so around then. Brakes are easy to replace and dual-pivot a good upgrade, so not odd that they are later.
Unless you fit STi there's no upgrade to be had with the levers, so they're more likely to be original especially as they match the HS.
Are the cranks 1050 (look on the reverse for a model number)? Cranks are one of the more expensive parts of a groupset and if you're sticking with a square taper BB, there's nothing to be gained by replacing the OE item with something from the same group.
The team bike story was probably told to my friend by whoever sold it originally as part of the sales pitch and it's been passe down the chain. The H Lloyd decal is exactly the same as the one on the downtube, which helps. I'll give the frame a second cleaning and see if I can find any identifying marks on the dropouts, and get a pic of the seat stay bridge. The headset does look like the 1050 from your link, and the brake levers match too, but the brakes are 105 dual-pivots. When did 105 go dual-pivot?
Thanks for the info, much appreciated.