✅ SOLVED Bullet with weird thing on the side

[Detector mom]

I’ve found lots of bullets at this particular permission, but never one like this. Or is it not a bullet? Maybe a lipstick of some kind?

 

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[The Rebel]

Not a bullet or shell casing.

 

[Retired Sarge]

Marker cap....?

Is something embossed on the clip thingie?

 

[Kray Gelder]

I’ve found lots of bullets at this particular permission, but never one like this. Or is it not a bullet? Maybe a lipstick of some kind?

Fountain pen cap, IMO.

 

[Detector mom]

So you’re right: it’s a fountain pen cap, probably from a Waterman pen, c.1920s, like the one below.