The brass ice bucket does indeed have a mercury glass liner and they were produced in the shape of an apple! The pieces were originally produced by the Apollo Studios in the 1920's. All originals are marked underneath with Apollo Stamp.
Apollo Studios of New York was a division of Bernard Rice & Sons and pieces marked "Apollo" were only made from 1920 to 1922. Please note the dent can be considered artistic, like a singer who's voice cracks this apple is beautiful but not perfect.