From my patent bals:
The "|" could be a number 1 but it's a little taller than the 1s so...
115D is the size. They are marketed as US size but I've found the bals run big and the pumps - which I've tried at 346 but don't own - even bigger. I wear these with silk hose. I also throw insoles in them since the black tie events I attend are more of the stand-up (cocktails & dancing) variety than the sit-down (dinner and speech).