jail or gate keys?

have had these big ole keys for awhile.I always thought were jail keys, but am wondering how to tell if they aren't old gate keys. Any help out there?
Also how can I find out the value, I'm used to doing research but have come up dry on these. Thanks
Mike

Any possibility of a photo ?

have had these big ole keys for awhile.I always thought were jail keys, but am wondering how to tell if they aren't old gate keys. Any help out there?
Also how can I find out the value, I'm used to doing research but have come up dry on these. Thanks
Mike

I try getting one on later tonight.
Thanks,mike