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@edscoble
They're called bilaminated, they're strictly for look as they cost quite a bit, it started off as a flat piece of metal that has been carefully cut to shape, once the frame has been fillet brazed, the 'lugs' then is wrapped round the frame and brazed on (that why they look very thin), to give an illusion of an actual lugs.
so technically, they're not lugs at all, hence why it's a very expensive construction.
Look awesome though, here's other example (repost warning);