Here are another two serials.
The blue one on the upper right in my photo is serial E078918. Pinch bolt saddle clamp, English threading. Came to us with Campy Gran Sport cranks and BB, 3ttt bars and stem, American Classic seatpost, H+son/Ultegra wheelset, and Ultegra 10sp drivetrain shifted by indexed bar-ends mounted on the downtube. Clearly a mishmash of upgrades and whatnot, but I think the BB and stem were original. I had to unstick the stem from the steerer by drilling/milling it away.
A near-identical blue frame is also in possession of the club. It is serial E067884. Same deal: pinch bolt, English threads. Bought as a bare frame. Haven't been able to find a fork with a steerer long enough for it. Interestingly it is drilled and tapped behind the BB as if to take a fender.
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Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.