Abstract: A miniature bank having the form of an armored safety-deposit truck whose coin-compartment is closed by a back gate. The latter extends forwardly under the compartment with a tongue which crosses over the rear axle of the truck. The axle therefore bars the tongue, and keeps the back gate from being opened. The wheels are made flexible, so that either can be pulled off the axle and permit it to be retracted to a point no longer blocking the tongue. The back gate may now be raised open. This procedure is kept secret from a juvenile owner of the bank; and the normal appearance of the wheel mechanism disguises its alternate manipulation.