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If you look closely at old photos from the 1950's you will see that it was normal for top pros to be given frames with mudguard eyes.
Koblet used a Campag rear mech for that '51 tour, so I'm afraid that is another reason for doubting that your machine was his. It looks a very desirable bike who ever was its first owner - I hope you find it suits you when you get to ride it.
I expect you know this, but Hugo Koblet won the 1951 Tour de France on a 'La Perle'.