money box 
noun British
A box used for saving money in, with a slit in the top through which the money is dropped.The 10-year-old English Martyrs School pupil is donating the cash he has saved since Christmas in his safe money box to the Supporters' Trust....
- The boy also grabbed a money box containing £100.
- And before that I always saved up my pennies in a money box for rainy days.