The only way to get the coins out is to break the bank. This was made of square glass block for the World's Fair and these have a value of $12.00 to $35.00 depending on condition. Based on that, you can decide whether it is worth it to get at the coins. There are quite a few out there and they are not considered rare.
Any silver coins (dimes, nickels or quarters) that are dated before 1964 are made of 90% silver which would end up being worth more than the bank if the bank is full. Just a thought.
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