What pinball machine could this be?

[QuarterJunkie]

I don't have a very good description here but I'm trying to identify an old pin that I vaguely remember as a kid.

It was around the mid 70's vintage and all I can recall is that there were some red balls (about the size of a tennis ball) in the back glass of the machine that would pop up and accumulate as your score increased. Anyone have any clue as to what this machine was?

TIA

[shardian]

Here is a list of pins from 1965-1980 that had a mechanical back box. Look thru them and see if you can find your machine.
http://www.ipdb.org/search.pl?specialty=23&yr=1965-80&searchtype=advanced

[QuarterJunkie]

Thanks. It looks like flipper clown is the closest.

[Q*Bert_OP]

Are you sure it wasn't Gottlieb's Mibs: http://www.ipdb.org/machine.cgi?id=1589