Looking at the sections of Punch, as she is turned over on the beach at La Baule, it appears she wasn't an extreme-V hull but rather a semi-circular hull. (The IYRU had initially specified the sliding seat as the only permisable hiking out aid, but allowed trapezes after Elvstrom showed up at the first set of trials with his Trapez singlehander. Still most competitors stayed with the sliding seat - with the exception of the Contender.)
Yachts and Yachting, September 29, 1967
For the last set of trials at Medemblik, surprisingly, Punch was well off the pace. Punch was hamstrung by a very high hull weight. The IYRU had specified hull weight based on sectional shape (a sort of scantlings restriction); the wider, deeper shape of Punch had to weigh more than the narrower, lower freeboard type such as the Contender. Three competitors, the Unit, the Jeton, and Punch at the weather mark at Medemblik:
Yachts and Yachting, June 7, 1968
Hubert Raudaschl, a Finn sailor, designed Jeton, which, in the last set of IYRU trials of 1968, took over the round hull-shape, low-wetted design mantle from Punch and finished second to the Contender. Below is a photo of Jeton at La Baule. She sported these weird set of folding seats that stored flush to the aft deck and individually swung out when needed. It was a feature that definitely would have needed to be changed out if she had been selected. In 1970, the Jeton hull was flattened out and re-purposed as a two man, main, jib, spinnaker dinghy.