Thanks guys. Mine is not labeled Brevet between the lugs so I'll have to go with another Twinlock. If you spot one, sing out!
How did I pooch it? The threads were already weak, I only had about one turn of threads left and I'd been nursing it along for the last 12 years like that. Today I was getting ready for an epic mtn bike ride and was in a big hurry getting gear together. I grabbed the Sub and unscrewed it to set the time, as I was running around packing up. I set it, pushed the crown in a click to give it a couple winds, and as I was getting my backpack out, clicked the crown in and twisted to screw it down. I wasn't paying attention and got it so the last remaining thread was barely engaged, then gave it a turn. It didn't thread, instead it stripped as I turned it. I grimaced as I felt the last thread come off, and stopped barely in time. Now there's the tiniest bit of thread left, maybe 1/16th of a turn. It will hold the crown in, barely. Dangit. My fault entirely.
So if anyone sees a good crown, let me know please? I'll chase the threads on my tube and see if it can be salvaged.