Once you think about it this is actually a rather useful concept...
a pretty keyring, which is also a little pair of nail clippers AND a nail file. 
The clipper part is 5 cm long and then there is an extra chain to add your keys, or just use it to attach the clippers to the inside of your bag so you don't lose them.
They are sturdy, work well and have really pretty enamelled flower designs.
You can choose which one you'd like by clicking on the design description -  the relevant picture will show at the top of the pictures.
I have seen the symbol on the back on other items that were also marked
Made in Japan.
Probably in the 1950s.