First time detecting local park and got a Silver coin

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Decided to look up some historical photos of my area and went to a part that looked unchanged since the early 1900’s, took my SDC 2300 usually used for gold down south and first few holes pulled up this 1915 Silver One Shilling… Wonder what else is in the area!

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Also found this horseshoe that’s completely rusted through and i could snap it in half easily if i wanted, dont know if that means its very old like the coin or the area is just really bad for iron