The beauty of this variety is that it is so easily recognisable to the naked eye.
I wonder how many are extant, and why it was never spotted before. I'd hazard a guess at <25.
Like you, I check every 1862 for one of four things, F38, F39A, F41 and VIGTORIA.
You just never know when one will crop up, as indeed it has for our guest.
Ive just had a look paddy and it looks like the pennys are out
https://www.ebay.co.uk/itm/2017-1P-PENNY-from-THE-ROYAL-MINT-BAG-FRESH/392097576820?hash=item5b4ad63774:g:3jwAAOSwAC1aHUfD
The first might be on the punch itself. Letters are frequently composite, e.g A is often made from an inverted V with the crossbar added separately. The first looks as if the bottom arm was entered separately.
Punches also broke but continued to be used for the remaining detail, so you could potentially see traces of a different letter. The second looks a bit like a D, but the top of the curve looks more like a die flaw.
The art and craft of coin making - A History of minting technology by Denis R Cooper published by Spinks 1988 ISBN 0907 605 27 3. second hand cost around £250
There are links in Googlebooks and openlibrary, not sure if they show the whole book or parts