Hello everyone,i am new here and have leaned a lot from reading the forum,really good tips & tricks,thanks a bunch.I went out metal hunting and found this item that does look like a miniature camera,but then others say no way there is no were to open it,it is to old looking for that,it is heavy,well made and does have a small air like slot around big opening.One person suggested some form of camp light with needle valve control,were one would put the fuel in the bottom.Or is it some kind of small sight glass?.Has anyone seen anything like this before?.Thanks for any help.I did find this with a tesoro detector,and i will list on what is it forum if no one has ever seen this before.