1940 GB penny question

What's the story on the exergue lines for the 1940 British penny issue. There's a one line and two line variety, but which one is harder to find? Is there a premium attached to the better coin?
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Quite frankly, I'm surprised they give such a low premium. I've never found a single exergue piece in my travels.
Freeman has the pieces as C2 and C13 respectively.
I have had no luck with this at all... and I think the variety is under appreciated and not valued appropriately
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Well, just Love coins, period.
Experience the World through Numismatics...it's more than you can imagine.