This Abercrombie & Fitch piton was made by Hupfauf in a factory located in Einsiedeln Switzerland. Hupfauf was manufacturing many mountaineering gear items back in the 1920s. I am not sure exactly when Hupfauf started creating pitons, but Hupfauf went out of business in 1948. My guess is that this Abercrombie & Fitch piton was created sometime between 1920 and 1948. The Hupfauf blacksmithing in Switzerland started when Anton Hupfauf moved to Einsiedeln Switzerland in 1898.
History from Wikipedia: David Abercrombie founded A&F in 1892 as an upscale sporting goods store. Forming a partnership with Ezra Fitch, the company continued to expand in the new 20th century. After Abercrombie left the company, Fitch became sole owner and ushered in the "Fitch Years" of continued success. Shortly after his retirement, the company continued to develop under a succession of other leaders until its financial fall and closing in 1977. Limited Brands purchased the ailing brand in 1988 and brought in Mike Jeffries, who revolutionized the image of Abercrombie & Fitch to become an upscale youthful fashion retailer. Today, the company is a multibillion-dollar entity continuing to experience economic expansion through the business continuance of three offshoot growing concepts and cautious international expansion into key luxury markets.
The company was originally established as Abercrombie Co. by David Abercrombie on June 4, 1892, in a small waterfront shop at 36 South Street in downtown Manhattan, New York. Wealthy New York businessman Ezra Fitch became one of the store's regular customers. In 1900, Fitch bought a major share in the growing Abercrombie Company and thus joined as co-founder. Aberr 2010}} The partnership between Abercrombie and Fitch did not end happily. The two men, with different visions for the future of A&F, quarreled frequently, although the company continued to prosper. Fitch wished to expand the company's appeal to the general public, while Abercrombie wanted to continue selling professional gear to professional outdoorsmen. As a result of the disagreement, Abercrombie sold his share in the company to Fitch in 1907 and returned to manufacturing outdoor goods. Fitch continued the business with other partners and directed the company as he pleased.
This 1956 Summit magazine lists Abercrombie & Fitch as a supplier of Technical Mountaineering Equipment. I am not sure what mountaineering items they were selling at that time. History shows Hupfauf went out of business in 1948.