Hi everyone, found this today at an 1843 house i have been detecting and am wondering what it is, it measures 2''x almost 3'' and is 5/16'' thick, it came up badly bent so i have done the best i could to straighten it out, there is an outer door that opens, then a small inner door that swings up and reveals a small compartment inside, i am going to post pics in order of opening, then the last pic shows the back side, any ideas on this would be great, thanks much.




the coin used for comparison is a nickle.
Chuck.