Just a ball park figure. Just watched a bit of the tour from around 1976 and was arguing with a friend about the weight if the bikes.
So what were knocking around at then.? I would say about 25lb.
A decent weight for a tourer was 25lbs. top level race bikes would have been lighter
21 -> 23lbs when bikes were made of Reynolds 531c.
SB
an article in one of the bike mags a few years back- possibly as long ago as 2005- suggested 21-23lbs.
[url= http://www.43bikes.com/raleigh753.html ]Ti Raleigh from 1980[/url]
17.2lbs, does that help
[img] 
[/img]
My Raleigh clubman weighed about 23Lb when built in 88. 531 frame (but just a chromo fork), Shimano 105 groupset, Mavic MA40's on 105 hubs, Cinelli bar and stem, Rolls saddle but a no name alloy seat pin. So I would imagine a 753 frame with Dura Ace kit could be sub 20Lbs.
I think my 60s Flying Scot is just over 20lbs.