valve identification

Hi, I am looking to buy thread gauges (go no-go) to improve my accuracy and quality of visual inspection of threads. I stumbled on 3 types of ring gauges (to test the valve threads): 1. Smooth ring gauge 2. "Cracked" ring gauge 3. Regular ring gauge (I attached sample photos) What are the...

Hello friends. this valve came from an al80. it's yoke. the only number it has on the back is 3694. i'm torn between harrison or sherwood but it has the markings of none. thanks!