Undoubtedly my oldest coin...maybe?

[IowaRelic]

Sun was barely cracking and my spade pulled this up...

this thing is totally wiped as you can see. The reeded edge is the giveaway.
it’s very close to a quarter in diameter but only about 1/3 as thick. My hunting partner believes it’s a Spanish bit. For the location, it could be Spanish, French, or British. Any ideas? There really is nothing to go on.

 

[Ted S]

It's cool!

 

[laplander]

Its definitely a hammered coin LOL not much left to go on, congrats on a silver!
HH Jeff

 

[Monkeys Uncle]

Splintered "piece of eight"?? Darker mark in its center appears to resemble a symbol..."right arm/side of a cross"???? Also, upper left of same side looks kind of like the number zero next to an "ampersand" symbol??? "Reeded" edge is a problem if Spanish silver. It's a true mystery.

 

[Mark kus]

Come on guys!!!! like Jeff said its a Hammered! no doubt! LOL
Mark

 

[Monkeys Uncle]

Here are some internet pics...note absence of these Spanish coin's normal "round" shape. Also note "bottom right" coin with somewhat similar "0" and "ɛ" shapes on its left?? I noted same likeness on your 2nd image as described in post above. Probably a huge stretch and your find may just be a piece of silver jewelry/token that someone placed on a RR track by some kids for "Let's see what happens" curiosity??? At any rate, good luck.

<--- "0" and "ɛ" shapes? PS - I'm not any good at copying/posting images...as you can see.

 

[IowaRelic]

A reeded edge would be a minted or milled coin so it’s not a cob. Or a true hammered coin. Does anyone know of a French or British coin like this? They spent more time here in Mobile than the Spanish really.