I've just added a note of observation on the scarcity of the variety which I think will be useful to collectors
https://en.numista.com/catalogue/pieces9359.html. I am not sure of 13 coins and their split between the regular and overdate (7 vs 5) are a good sampling, but I feel that it is good enough to be noted, given that these 13 coins were pulled out of the mix of 300+ coins from all Elizabeth II circulation denominations with majority being 25 cents and clearly not coming from the same roll(s). Will appreciate a referee judgement or opinion.