I agree it shouldn't matter, but if you really want the numbers, go to the weightweenie site, where there are tables of weights for all manner of bike stuff. See if you can look up a Raleigh Professional from maybe 1974 or a Colnago from around 1980. They'll be a good indication of what you can expect. Don't be surprised if your frame does not match what you find out there, and if it is around 2 pounds heavier than an aluminum Cannondale. Just google weightweenie, it'll pop up.

If it might make you unhappy, or make us unhappy if you start a thread crying about vintage bike weight , don't go there. We already expect vintage steel, even the lightest of the day, to weigh more than aggressively light aluminum (no, we are not considering mid-30s constructeur machines here), but we don't care. Some modern steel can give modern "other" a run for their money! Otherwise, knock yourself out and have fun with bike geek numbers!