OK, look at this picture......

This is NOT what I saw but similar.....

http://www.ebay.com/itm/VINTAGE-SIL...R-/151321554614

The pc is of a melon baller. The tool I saw was older and not aluminum.

The main difference is that the half balls are not scoped out like these are but they are filled in solid.

Any idea what it is used for?