Coppi's TdF Bike

Posted previously, but still worth another look. Fausto Coppi's bike just before a time trial during the 1952 Tour de France. Is that an Ambrosio aluminum stem? Universal "Extra" brake calipers. Look how high the shift levers are mounted... were they just trying to clear the Bianchi decal? Thin double straps holding the bottle cage to the frame. First version of the Gran Sport front derailleur with short outer plate (see also next two pictures). No chrome on the fork blades. Metal cable straps on the toptube (instead of bar tape). Dark full-length housing for the derailleur cables, held in place with early Campagnolo metal straps. Felt cover on aluminum water bottle. What kind of chainset is that again? What else have I missed?

(Watch appears to indicate a time of 9:20. Thanks R.C.)