'oldfoneguy' is correct in my opinion. The 'Buffington' rear-sight on the model 1873 'trapdoor' Springfield, the Kragicon model 190l rear-sight, and the model 1905 rear-sight of the 1903 Springfield rifle all share a pedigree and the influence of Chief of Ordnance - Adelbert Buffington.

(By the same token, the Krag model 1898 & model 1902 rear-sights, as well as, the sight found on the early 'rod-bayonet' 1903 Springfield rifles share features designed by Lt. Tracy C. Dickson).

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