Most likely from a German M24 hand grenade (Potato Masher), from the fuse end on the bottom of the handle/stick.
Can you read the Waffenamt (WaA) number? Is the number WaA 59
4? If so, it stands for Vossloh-Werke GmbH, Werdohl/Westfalen
Here's a link to a grenade (M24) that has the same Waffenamt.
Original Item: Only One Available. This is an extremely rare M1924, M24, or "Stielhandgranate (stalk hand grenade) 24" German Stick Grenade, often called a "potato masher". This example, acquired from the family of a WWII veteran, has been demilitarized according to specifications by the BATF...
www.ima-usa.com
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Edit to add: Great site that shows which part I'm talking about and how it works.