That is a whole lot of yellow! The player in both pictures is Al Severinsen.
According to a story a few years back by Paul Lukas on his amazing Uni Watch site, these caps were only worn for Sunday home games during the 1972 season, which helps explain why there aren't that many pictures showing this unique cap.
Even though this was apparently only a "Sunday Special", the design does show up in a couple of other interesting places. Here is a picture of the Padres Bullpen Buggy, and its got the wide-spanning panel on the cap: