Gene Powell wrote about corks:
Strictly speaking, I was under the impression these are all Portuguese
corks. They are merely being acted upon by the various beverage they help to contain.
Following that logic, all frames built of 531 are British. And with that, I nudge the thread a bit closer to being on-topic.
Best regards, Marcus Helman Looking out my window at the crowds gathering for the Red Wings parade in Detroit, MI