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Yeah it's alloy - does that make very much of a difference? The Campag steel one snapped on me regardless - and the eBay one is CrMo! Also inclined towards the Condor one simply because I can swing by their shop tomorrow to pick one up rather than having to pay twice over for shipping (then waiting a few days to get back on the bike).
Frame is a Bob Jackson of 1990s vintage (guessing from the DT shifter bosses and tubeset, but don't actually know provenance as bought as a frame off someone here) - no idea why the seat lug is not threaded.
Is that condor one alloy? Sugino are chrome steel and have nice deep Allen key slots. Unusual for an expensive 753 frame not to have a threaded seat lug.