Close Snap Cap, and it actually could be designed to also be used as a 'grenade'. It is a fire extinguisher and has a spring loaded 'hammer' that you can't see that has a lead link that melts when exposed to fire to release it. The hammer swings up and breaks the glass, releasing the chemical, whatever it is. I found the glass part one year and the mount years later and somewhere else far away and somehow recognized what it was for and reunited them.
"Tool guide" is close also but not quite. Keep trying. A better picture would help. Maybe tomorrow. It also has a very specific use. There are several Parker Pages in the pile also; you just can't see them.
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