I always stop and look at any 1827 dime I see with hope of finding that JR-14 but in all honesty the JR-14 is fairly easy to spot which speaks for its rarity that still so few have popped up but if I am going to be honest i must admit I have no idea how to attribute the JR-10. The JR-10 has come come from a R.7 to probably a R.5+ or so but I don't know the best way to attribute it. I used to always look to see if star 8 was in the right position and then look at how far left the "1" in the denomination was in regards to the claw but after looking at a few JR-10 that have sold I am not sure how good of a job I am going because I looked at 2 recent JR-10 sales and looked at the denomination and I would not off seen a JR-10 if the coin was in my hands. In my mind it was much more visibly to the left than I think it really is.
The right foot of A2 is lower than the left foot of M. That is rev AE which was used on JR-7 and JR-10. On JR-7 star 7 points BETWEEN two dentils, on JR-10 it points at the upper half or upper edge of a dentil
