Regarding the sight mounting, there are both pinned and pivot sight on flatside 20-shot examples. But I have never seen a 20-shot coming with 100-1000 sight leaf -- that should be an error in description, Supposed being 1-10 sight leaf. The side notch of the leaf also indicates it's a 1-10 leaf. I will be very surprised it's indeed 100-1000. The sight parts are supposed being numbered to the gun.
The sight ramp of 20-shot looks correct. The sight ramp on that VL&D small ring also looks right.
Another flatside 20-shot sold by Hermann-Historica a few years ago, it has pivot sight (see picture). Yet another flatside 20-shot was printed on Joe Schroeder's "Gun Collector's Digest" (4th Ed). Owner was C&R dealer Randall Bessler. He acquired it in poor shape. Unfortunately, he hired a professional having it refurbished. But that's irrelevant. Gale Morgan showed its coming shape - "1300 Grams of Rust". It's obviously original before restoration. It has pivot sight too. There is no doubt on some 20-shot flatside coming with pivot sight.
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