Whoa that's cool looking. Anything in it?
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....Pretty interesting ! So...The "back side" is open ? The spine , as it were , might give up clues to its origins.
Had something been soldered to the placard ?
Don't know what their called but they were used as you might guess to put valuables in and place amongst other books on your shelf.
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Nice crayon safe! It's for hiding your child's crayons so that they don't draw all over their walls... or at least that's what I'd have put in one this morning if I knew how the day was going to go.