Aha! Since you mentioned Rivendell, I hauled out my old Rivendell 2000/2001 lug calendar and it has a picture of a set of head and seat lugs with identical cutouts in the top and down tube sockets. (This calendar has beautiful studio photographs of interesting lugs for each month, but no bottom brackets are shown, probably because even some of the fanciest lug sets had rather plain bottom brackets.)
Unfortunately, these lugs are not identified, but the description matches what Trevor quotes. Here is what it says:
"Anonymous. The most intriguing lugs in the whole calendar, because they are the oldest, the crudest, as beutiful as any (in their own way), and we don't know much about them. We know: They're sand-cast, an ancient process still employed today in many industries, in which molten metal is poured into molds formed by various combinations of sand and rice hulls. They're from the 1930s. We think: They're from England, in which case they're likely a Chater-Lea or B.S.A. model - a frame fitting powerhouse from the early 1900s to the 1950s. Most of the top British builders of this time used fine cast British lugs from these firms, or the even finer ones from the superb Belgian maker, Elka. Interestingly (maybe), the Nervex lugs followed in the mid to late '50s, and the keen snoots regarded them as cheap, stamped, mass-produced fake art for the 'ignorant British club cyclist.' The only person we know of who might be able to identify this set of lugs is Dick Swann."
It seems that Peterson didn't have the bottom bracket that goes with this set because he only "thinks" they're from England, whereas the posted pictures of the bottom bracket clearly say "BRITISH MADE".
John Betmanis Woodstock, ON Canada
At 02:24 PM 18/06/2007 -0700, trevor segraves wrote:
>Grant Peterson did a right on these very lugs in The Rivendell Reader no.
21. He said they were sand- cast in the 30's, and assumed they were made by
B.S.A. (British Small Arms), possibly Chater-Lea, though more likely B.S.A.
He whent on to offer a $1000 to the first person to submit a photo of a
complete bike made with these lugs, dead line, 1/20/2001
>
>Hope this is helpfull
>Trevor Segraves
>Lake Forest Ca.
>
>----- Original Message ----
>From: Eric Phillips <altinos@gmail.com>
>To: classic <classicrendezvous@bikelist.org>
>Sent: Sunday, June 17, 2007 4:31:48 PM
>Subject: [CR]Lug identification.
>
>>From another list, she picked up a bunch of old steel lugs and could
>use help identifying them. Any ideas? She's in New Zealand, since
>she didn't sign off. :)
>
>Eric Phillips
>Southfield, MI
>
>---------- Forwarded message ----------
>From: Anne <Artidomal@xtra.co.nz>
>Date: Jun 17, 2007 7:22 PM
>Subject: [Bicycle_Restoration] From the great hoard of lugs.....
>To: Bicycle_Restoration@yahoogroups.com
>
>
>I scanned one of the bottom bracket lugs; - I've got quite a lot of
>these and you wouldn't want to stand on one if you're in the bad
>habit of wandering around your workshop barefoot.
>
>http://img145.imageshack.us/img145/7238/bottomlugep2.jpg
>
>http://img340.imageshack.us/img340/3293/bottomlug2we8.jpg
>
>http://img340.imageshack.us/img340/9143/bottomlug3tj8.jpg
>
>I haven't done a proper sort out yet, but I think I've got full sets
>of this style of lug. Lacking for a name/make/brand I've dubbed
>these the 'Ouch' lugs because they look so bristling and fierce when
>heaped together.
>
>I'll do some more scans soon,
>
>Cheers,
>
>Annie