To me, that Bottecchia looks beautifully proportioned.
I think older frames with relaxed geometries and large mudguard clearances look best with 700C x 28 (as on my 1959 Capo) or even 27 x 1-1/4" tires (as on my Peugeot). I even have 700C x 28s on my somewhat tighter Bianchi, although these are undersized Continentals -- "real" 28s would rub on the chainstays, and perhaps even the brake bridge and fork crown.
For general-purpose cycling, even with my non-racing club, I feel a bit safer and more secure on a slightly wider tire, in contrast to my days of being "20-something and immortal," when I eagerly migrated from 27 x 1-1/4" (32mm) to 1-1/8" to 1" (25mm) and even 7/8" (23mm).
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069