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The Triangle-in-Circle mark was struck between 15 Jul 1641 and 28 May 1643 H. Triangle alone that was 4 Jul 1639 - 26 Jun 1640, which might be where the confusion lies. This is based on the trials of the Pyx dates given in the preface to the Brooker collection book.

To demonstrate my earlier statement, here is a Charles I type 4 crown with mm. R in brackets over P in brackets. Stress marks everywhere, but a rare mark, so forgiven to some extent. All (R) crowns are over (P) - see Coopers BNJ article.

well spotted Terry, got me looking at my three 1861 Gouby G's , the first from LCA and then cheap examples from Ebay and the Midland Coin Fair. To my mind the second coin could also be a 're-entered colon' example, though with a narrower colon in this case. What do you think? Jerry

Just to clarify, as Rob tried to do, it is a One Shilling coin (or 12 pence), not a 12 shilling coin.

Anyway, that's a shilling. What about the halfcrown? You tend to see them more on larger flans, which is probably a reflection of the greater difficulty in getting the correct and even temperature conditions across a large flan than a small one

I have this excellent little poster that gives answers to questions like this. Probably still available online somewhere. This indicates only Edmund Ironside and Lady Jane Grey as the "No coins" examples. I had an earlier version of the chart years ago, which also showed Sweyn Forkbeard as impossible, but it seems that has changed. Edward VIII is possible if you go outside the UK. British West Africa and a few of the other Commonwealth Countries issued his coins in good numbers, though without his head, only his name.

Michael G has a summary on his page: http://www.michael-coins.co.uk/GB20pence.htm

I didn’t even know there were two different designs on the 1992 20p?