Titanium was used on the SR rear mechs only (apart from for the axles in rare bottom brackets). I think the use of alloy brake shoes occured around the time of the second generation 'triangulated' brake calipers I'm not sure they were avaialble any earlier than that. The difference, to my understanding, between NR and SR brakes was indeed down entirely to the brake levers -- drilled for SR, plain for NR with the campag logo boxed, and plain on GS levers without the box.
I though this too about the V1/V2 calipers but there were some early G1 Nuovo Record Caliper sets which came with SR groupsets which had the alloy pad holders - http://www.velobase.com/ViewComponent.a ... &AbsPos=41
I've had a few of these alloy holder V1 caliper sets come through our workshop over the years. There were also some titanium axled NR hubsets which were rumored to have been badged as SR but these were legendarily brittle - http://www.velobase.com/ViewComponent.a ... &AbsPos=71
It's usual IMHO to assume a SR-equipped bike to have the following to be a proper SR bike...
SR rear mech
SR front mech
NR Strada Crankset with SR-specific rings
NR/SR calipers with alloy holders
NR DT shifters
With the 'possible' exception of the calipers I'd argue that without these the bike hasn't really got a correct SR groupset.