Any ideas?

[necn24]

Can anyone tell me what this could be at first i thought it was a button but now not so sure TIA.

 

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[bowwinkles]

Looks like a heavy duty snap (plunger end) used on canvas items. We had them similar on entrenching tools in the Army.
https://www.ebay.com/i/312550857337...MIiYrN3IeW6AIVBJ-fCh1EQgXxEAQYBCABEgKokvD_BwE

 

[nsdq]

Snap for heavy canvas pouch

 

[DCMatt]

Finial off an old screen door hinge.