Need help with ID!

[mdparsons]

Need some help on this one. Found it today detecting in an old church yard in Maryland about 6" down. Its non-ferrous and weights just over 2 lbs. No clue what it could be. Has a small hole in the top and sounds like something inside but it is very heavy. Looks like it reads "National Patented."
Thanks for the help!

 

[Digger RJ]

Need some help on this one. Found it today detecting in an old church yard in Maryland about 6" down. Its non-ferrous and weights just over 2 lbs. No clue what it could be. Has a small hole in the top and sounds like something inside but it is very heavy. Looks like it reads "National Patented."
Thanks for the help!
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Nice!!! Congrats!!!

 

[oldmxrat]

Hmmm, I remember seeing one of those posted here in the last year or two but I can't remember what it turned out to be. Search back through the whatzit posts, it might be there or 'today's finds'.

 

[Gare]

Can anyone make out the letters on it ?

 

[Georgivs]

I posted a similar object in the what is it forum, turned out it was a dental mold for vulcanizing dentures!