Wrong ring used on old souvenir cup?

I noticed that my souvenir cup from 2017/2018 has a Dodgers National League Championship ring on it from 1956. The Yankees did win the world series that year, and the Dodgers were in Brooklyn, so maybe it was intended. It seems a little odd, however, to include another team's ring and not include the 1956 world series ring. Thus, I think it must be a mistake. Just an interesting thing I noticed today.

Photos (including the correct WS ring)

Ok, sorry for interrupting the daily "DFA Gallo, Fire Cashman" conversation. Carry on :)