Been there! I see something in the loop of the 6 also, but does'nt look like it would match up with what you see at the top. I have a simular 16' that has another loop below the 6, a matching section in the loop, and also through the top curve of the 6. with notches on all the numbers, and something in the loop of the 9 and more. But I'm told I see and have nothing.
Try changing your lighting and maybe add one to just light up the shadows made by the other light. You may see more, or less. Also try raising one edge of the coin by an eighth inch or more to cast the light more across than down. this may help you too.