Can anyone tell me what this clock is called?

My grandma had one about 15-20 years ago it used marbles for time pieces an arm would swing around every minute and pick up a marble and drop it on the top row the 2nd row was marked off in 5 min incrments and the 3rd was in hours just like a clock at noon/midnight it would drop all of the marbles to the bottom to... show more My grandma had one about 15-20 years ago it used marbles for time pieces an arm would swing around every minute and pick up a marble and drop it on the top row the 2nd row was marked off in 5 min incrments and the 3rd was in hours just like a clock at noon/midnight it would drop all of the marbles to the bottom to start the process all over again
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