Antique Metal Coin Bank The Thrift Book Prudential Ins

I found this in a box of stuff, long stored away. I assume it's a Prudential Insurance advertising give away. This little bank looks like a book with leather, or leather-like, cover and metal corners. T is a coin slot in the top and a key hole on the bottom. The cover is easy to read and photograph but the Spine edge took a bit of staring. T very lightly it says: The Thrift Book at the top, lengthwise was harder: Patents Pending / Zell Products of (can't read the word / Made in U.SA. I have no idea of it's age. It's got some marks of time, the bottom showing the most and that's just scuffing on the edge, overall it's in really good shape. The wear on the bottom is around the key hole, checking it further it requires no key to pop it open, you just stick something into the hole and pull. I don't see how it ever had anything else, but can't say for certain. It measures 3 11/16" x 2 1/4" by about 3/8" thick We expect winning bidder to respond within 3 days of auction end. If you are not paying immediately with PayPal please let us know how and when we can expect payment. We make our best effort to ship within two days of receiving payment. We Accept: PayPal (We will ship to the PayPal address on file) Money Order or Cashiers Check