I have looked at all 3 images above and cannot see any real difference where the thumbs are placed, so I doubt I could spot it that way, but I could probably spot one through the rim difference. I would have thought the lower trident is the most obvious. A couple of other things about the 1922, how can an earlier penny have a future penny obverse. And why does that dot on the trident comand such a high value? Many coins have flaws and dots and other minor oddities and they have no value. Lets take the Gouby X as another example,the a I in Brittt points to a tooth, and it becomes a major find and valuable, but a 4 in a 1944 is points to a tooth and is of no interest. Is it because the ones that have a value have been catalogued by experts? Thanks in advance for light thrown on these questions