Sharp-eyed Lou Deeter pointed out off list that my frame and fork (58 c to c)couldn't be three pounds--silly me. It's about 3 kg (!), as I hadn't changed the settings on the digital scale. Light as a feather indeed.
Also, the seatpost that came with the bike is undersized at 26.6. It should probably take a 27 or a 27.2, as the 26.6 brings the gap at the top of the lug almost to full close. Thanks, Lou.
Thanks, also to Peter Gilbert, who wrote that early Mexicos had chainstays without a crimp.
Proving once again what collective knowledge resides here.
With thanks,
Robert Aguirre Detroit, MI
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