Definitely a Jeffrey Hall Proteus. He was our best builder. He loved doing fancy work. The seat cluster was his idea, although he might not have been the first to conceive of it. We originally imported Cinelli crowns, but they required an ungodly amount of work to get a good fit with the fork blades. Later, we had our own very, investment cast that worked much better. However, they were exactly the same in appearance, so I really can't tell which it is.