Arrco used to use X stands poker of the back design , (X+1) stands pinochle of the back design.
For example, no.84 is tahoe poker, no.85 is tahoe pinochle. no.1 is streamline poker, no.2 is streamline pinochle.
Before I checked my decks I thought No.102 must be pinochle filigree back.
Then I found pinochle filigree back is No.201. What the..........