What volume liquid could it hold? How much does it weigh? What is the metal type? What type of cap or seal would it have had in your opinion? Could it be an early type of "shatter proof" container? Maybe for holding nitroglycerine?
Aw, come on dudes, lighten up a little. It looks like the glass end of the plunger from an old fashined bottle of nose drops. Really and seriously it does. JIM