Alans were glued aluminum, with extra thick aluminum lugs. This isn't one of those, but a nice steel frame...I'd guess later-70's from the frame detailing - the Guerciotti brothers started building frames in 1965, but I have no pictures of the early ones, and the ones that I do have have Guerciotti "G" on the fork crown, a star in the bottom bracket cutout, and simple dovetails in the lugs. The snazzy ones were supposed to have a separate plate brazed onto the bottom bracket with the Guerciotti signature engraved. I have no information concerning the lug logo in the picture...are those Campy dropouts (that's always a welcome sign).