It's a Savage/Stevens No 19 folding rear sight. There were two versions, tall & short, for use with different front sights. The tall was for use with the hooded ramp front sight and the lower version for more standard type front sights. The folding piece for the tall was straight across the top and for the low it had a curved down cut to lower the sighting notch. They show up occasionally on eBay but right now there are just some broken ones and one missing parts. They had a special elevator used only on this sight. Check the dovetail width, a few used on Stevens rifles had a narrower dovetail than the more standard 3/8".
Bookmarks