Another addition:
My 1973 Atala Grand Prix came with c'pulls similar to mod.61, but simply marked "UNIVERSAL - UNIVERSAL", and steel (!) levers.
Are the mod.51 calipers w/qr the same as "Extra"?
1935 mod.35 - side pull 1939 mod.39 - side pull, "Tenax" model levers, in steel and dural 1948 full rubber hoods on custom bikes. 1950 mod.50 - alloy, side pull, half rubber hoods 1951 mod.51 - alloy, side pull, full rubber hoods 1961 mod.61 - alloy, center pull (Pre 1968) Extra with QR (BREV 453949) mechanism 1968 mod.68 - alloy, side pull 1977 mod.77- center pull (Pre-1982) mod CX- side pull
Aldo Ross
Skinner's Terrace, Ohio