I loved these cheap toys when I was a tot in the late 1970’s. They were a favorite gift from any aunt who might be visiting during the summer.
Some websites list these as 1960’s toys; I’m guessing the Chinese manufacturers were simply using the same molds a decade later.
I seem to remember cracking or breaking one on more than one occasion, which is weird, because they weren’t made of glass. I also needed an adult to fill them for me, when I was very little — you had to fill them via a tiny hole in the back that was plugged by a small plastic stopper. It required a little finesse, as you had to run only a thin stream of water from the faucet to make that work.
I distinctly remember that dark blue Luger that you see at the bottom.