✅ SOLVED At a loss, think its junk but it has an 'F' on it?

[BlackbeardsGhost]

Thanks for taking a look, appreciate the time. Heres what i know:

its Metallic, but not magnetic
has a silverish color
Not rusty at all
Rounded edges
Sitting on the top at a river fording location
Has an 'F' on the back
Would have thought its part of a tank of some sort but there's no indication of rusting.

 

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[mick56]

Looks like melted lead that was in a pot and hardened.

 

[4x4x4]

....You might be on to something there....I have found similar, 4" disks that I believe we're the "reflector"behind the reflector lens.

 

[maxpower]

zinc anode?

 

[Loco-Digger]

Looks like someone melted lead for a purpose and this is what was left over and plopped out of the pot.

 

[BlackbeardsGhost]

Thank you all for the responses, Hard to say for certain but i think your right. Who knows, maybe someone else will find another one has another clue to verify what it is, but for now i'm going with one of your responses. Thank you for your time and for everyone else who came and looked!