Jerry Gallwas (born 1936) is an American rock climber active in the 1950s during the dawn of the Golden Age of Yosemite Rock Climbing. He achieved a number of pioneering first ascents including sandstone spires in the American Southwest, and the first ascent of the Northwest Face of Half Dome with Royal Robbins and Mike Sherrick in 1957. Gallwas made his own heat-treated chrome-molybdenum steel alloy pitons,  which contributed to the success of the climb.

In the early 1950s, most American climbers imported climbing equipment from Europe or acquired it from US Army surplus. Pitons from these sources were made of mild steel that twisted and became unusable after only a few placements. Gallwas recognized the problem and was among the first to make and use heat-treated chrome-molybdenum steel alloy pitons. He patterned his pitons after John Salathé's so they could be placed hundreds of times without twisting. These improved pitons proved instrumental to the success of the first ascent of the Northwest Face of Half Dome in 1957. That same year, Yvon Chouinard began to produce and sell alloy-steel pitons.

Tons more Jerry Gallwas history on Wikipedia.
Photo: Jerry Gallwas collection - Props John Middendorf
Jerry Gallwas angle piton in the YC collection. YC has it tagged that it was used on the FA of the Nose Route 1958.

- Letter "S" marked on one side.
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This is a unknown piton that I came across in the YC collection, I wonder if it is a Gallwas?

- Piton is marked "J" "CW" on one side and "CW" on the other side.
Jerry Gallwas pitons, photo by ..... ?
After a few hours my friend Rich and I were able to remove the three bong pitons, and replace the second pitch belay station of 5.6 ZIN, in Queen Creek Canyon AZ. We used the "car jack and a three foot long crowbar method" ..... and we lived!!!! But once the pitons were out I was confused on the manufacturer since two of the three were not Chouinard or LONGware. Many years past then I was told that the bongs were made by Jerry Gallwas. Thinner steel overall, and on the open side: the hammer end is a sharp 90 degree in shape, the front end is rounded.

I apologize for the Gallwas misspelling on the display info tag.