Our own Chris has written an article on this in predecimal.com!
http://www.predecimal.com/newpence
"Approx 450 minted (although there is no accurate figure)."
Its the 2P that is scarce jaggy with the NEW PENCE.
I notice the seller has the other rare 50p aswell.
Looking over the ones that have sold recently they are obviously sought after.
Well I also have a 1920 like Matts, not quite as well defined, but also on the reverse. I also have this 1921 with it on the Obverse only. Every time I have seen it It only seems to affect one side. maybe different weights of metal sinking to the bottom of the mix!!! Anyway here is mine. Just took it very quickly in a dull room and camera phone so sorry for quality!
The effect always reminds me of Tortoise Shell.
An 'upgrade', if you can call it that, of something that I find quite interesting, I like the theory behind expending the brass shells into the alloy mix after the war. One of the most affected ones I've seen.
Here a nicely toned 1651 Commonwealth Pattern Halfcrown by P. Blondeau i have . A precursor for the milled coinage that the Royal Mint would start to produce during the reign of Charles II
Apologies to any farthing/copper collectors as I'm sure this will not impress! This is not my main focus, but I like to have an example, and this is my best one
In the same boat, had more losers than winners over the years as I'm sure many have. All part of the fun and as long as it's not too expensive I'm happy to take that punt every now and then.
Sorry I read it wrong, thanks for clearing that up