Originally Posted by
AlexCyclistRoch
Is that BB lug corroded? Seems a bit more that you'd expect from a GOOD casting. And those dropouts look stamped. Looks like somebody is just marrying some old lugs of no great quality with newer 531 tubing.
The BB shell looks like a sand cast part. This was pretty common BITD. There's a lot of hand-work to make it look decent. Cinelli really raised the bar with their "Microfusion" castings in the 70s, and nowadays you don't see those gnarly old sand cast parts too often. Dropouts are stamped, again, pretty common BITD. And lugs would get a lot of hand re-working as well to get them looking decent.