Ahhh....I actually can contribute again, one of my 55-S's, this is quite the interesting coin....sorry no reverse pic.
It's listed as a 1956 D/S. There were two listed for that year and one was taken off as it was found out to be a die gouge as it was not found on earlier die states. This one CONECA has listed as a D/D. But on later die states the full S is visible.