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Skunked. The object on the right says Hoffman something I'm going to research it. Can the middle one be an iron buckle? It was a surface find. The other idk.
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sc-diggin, I'm the "Tom" that was alluded to by some others here

Been out of town a few days, not on my 'puter reading forums. Yeah, I've developed a reputation for having a bee-in-my-bonnet when it comes to the public spots/permission thing.
As you've seen, you've gotten 2 types of answers. Boiled down to two sides of the fence:
a) go ask someone at the school dept. "can I?" (even to the extent of "... and get it in writing!" haha). And.....
b) help yourself, till told otherwise.
The way I look at such things, is that if there's no rule in your city that forbids you from being there or a rule that says "no metal detecting", then ....... why would someone need to "ask"? I mean, are you or your hobby inherently evil or dangerous that this "needs permission" ? I mean, would you think you need to ask to fly a frisbee there? It's very rare that ANY city in the USA has a "no detecting" policy. But sure, if you're skittish, just look at the city website, where perhaps the municpal codes, laws, etc... might be linked. Or down at city hall in binder form. Or on the sign at the school entrance, etc...
The trouble with going and asking "can I?", is that ..... all too often, md'rs have netted themselves a "no", when no rule or law really exists, that says such a thing. You know, because some desk-bound clerk thinks you'll harm earthworms, or leave un-filled holes, etc... Or is simply in a bad mood and just picking the "safe answer" (when in fact perhaps the subject or thought would never have crossed their mind, nor would they ever have cared). And ...... sheesk ..... you want to know the FASTEST way to get a yes turned to a no? Just put a permission legal paper in front of them to sign. Just gonna conjure up legal implications, danger, risk, etc....