Deleted the post as it was mostly rubbish, and not intended to post.
The reason very few builders used the crown was because it was obviously welded, cast crowns were the thing then.
Having pulled many bent cycle forks in the 50s I can vouch for the strength.
One who used them was Bill Gameson when he was in the Armstrong works with Dave Duffield in the mid 50s.
A butted 531 Nervex pro silver brazed frame with Campagnolo ends retailed about £10
Keith