The WHA was an interesting league to say the least, and what might have been more interesting was OPC's approach to handling its business with respect to the league. OPC had been making NHL cards for a few years before this bump in the road existed and with the WHA beginning their season in 72-73, OPC decided to include them in their NHL set. What OPC did was dedicated a series 3 to WHA players which was cards 280-341. The following season, OPC released a WHA Posters Set and then in 74-75 OPC released its own WHA set featuring 66 cards including a checklist. Here is OPC's inaugural WHA set card by card.
74-75 OPC #1 The Howes/Les Howes
The card itself, feature all three Howes in a studio shot with facsimile autos of all three on the front as well.
This card certainly is one of the more famous cards to come out of the mid-70's and I think is one of those cards that most Howe collectors and WHA collectors must have. Personally, I don't think OPC could have picked a better first card for their set.