the EDA BB shell is a bit mysterious: it mimics the logo of the more common RGF (Gargette Brothers) shell, and some folks think it might be another brand from them, but the EDA shell has shown up on Jeunets, Louison Bobets, and Jacques Anquetil frames as well as some Raleigh Pros, too! I'd be surprised if it had Swiss threading, but since they must have made it with BSC threads...anything's possible!