Found this three decades ago in Oklahoma and just re-found it again among things in my old trunk. I used to use it as a paperweight but then put it away. I am not a projectile guy so I hope someone can tell me something about it. Age, type of artillery shell it was part of...etc. Thanks, vn
Your find is an artillery shell's fuze. Specifically, it appears to be one of the varieties of US Model-1907 Time-fuze for use in Field Artillery "Shrapnel" shells.
By the way... the name Shrapnel means a type of "anti-personnel" explosive artillery shell which contains dozens (sometimes hundreds) of steel or lead wedges or balls, which the shell's explosion would scatter among enemy troops. That type was invented in 1784 by British Army artillery Captain Henry Shrapnel. It has been in use ever since then and is still being manufactured today. During the civil war, the Americans called it "Case-Shot" shells.
Here's a photo showing one of those WW1-era Shrapnel shells (with your fuze type in it), which has been cut open for display.... but unfortunately, the dozens of lead anti-personnel balls that were inside it are missing.
Also, here's a diagram from the World War One era showing the Shrapnel shell with your US Model-1907 Time-fuze in it (the second shell in the diagram).