I was thinking about replica bikes today.
A Masi or Colnago, could be repainted as a team bike along the lines of what Eddy rode, say the Masi with Faema colors and graphics, or a plain Super as an Eddy Merckx branded bike in Orange. There are a few other variations on what the teams rode and production bikes that had equal looking metalwork.
The prior mentioned Speedplay Masi Special, where he has an original and its replicant.
The others would be a Masi Special Pista in chrome plate by Brian Baylis, better than the original from what it was based.
I think he did a Colnago too.
The last would be the Joe Skrivan built Confente tribute, pretty close, but not perfect. I could not find an active website for him yesterday. It is identified on the BB shell as a replica, Brian's on the fork crown for the Masi.
Making an identifying set of marks is appropriate.
It does bring up what about items like race cars where in a race wreck, not much is left to repair. But they do.