Well done Brian and glad your still enjoying collecting and the 1915 recessed were good finds. As you know i am not really into errors but sure someone will help you. I would call it "Throw it in the bin" . Be lucky. Pete.
I'm not sure what triggers it (an Admin like Tom Goodheart (Richard) will know), but I think you can edit once you have made a certain no. of posts (100?), and then for a number of minutes (?) after you have posted