I am looking for a rear sight adjustment screw for my dad's high standard pistol. The company was in Belmont Ca. I tried Numrich arms,but they don't show anything. I would gladly buy a complete sight. I don't know what other pistols had them. Any ideas. Here's a photo of the sight I found on the net.

I guess Numrich is sold out.....
376990D Sight Elevation Adjustment Screw $19.50 Sold Out

That is uaually a standard gun screw with grooves around the head. Find a screw that fits and make the grooves with a needle file or Dremel with thin cutoff wheel

Initially never thought of Brownells but they had it.

Hi-standard is back in business. I got parts from them before.