Odd that they would tweak the design for the last year of issue, and only for SF. If, as stated below, both types had roughly equal mintage, with 1,964,000 minted and probably 100-200k per die, 5-10 dies were made with that design.
David Bowers via PCGS https://www.PCGS.com/coinfacts/coin/1935-s-1/7379
David Bowers via PCGS https://www.PCGS.com/coinfacts/coin/1935-s-1/7379
Quote:
A new reverse: Two reverse varieties exist for 1935-S. The first is the standard, as used from 1922 onward, with three rays below ONE on the reverse. The second, a new die with four rays, apparently was discovered by a Mr. Berghli of San Diego, California, and was first publicized by Thomas W. Voetter in the October 1940 issue of The Numismatist. This four-rays die was used only in 1935 at the San Francisco Mint. Although both varieties are mentioned in a footnote in the Guide Book listing for 1935-S, and are occasionally noted in dealers' listings, very few collectors have aspired to own one of each. It is believed that both are of about equal availability.
A new reverse: Two reverse varieties exist for 1935-S. The first is the standard, as used from 1922 onward, with three rays below ONE on the reverse. The second, a new die with four rays, apparently was discovered by a Mr. Berghli of San Diego, California, and was first publicized by Thomas W. Voetter in the October 1940 issue of The Numismatist. This four-rays die was used only in 1935 at the San Francisco Mint. Although both varieties are mentioned in a footnote in the Guide Book listing for 1935-S, and are occasionally noted in dealers' listings, very few collectors have aspired to own one of each. It is believed that both are of about equal availability.