The broken one probably broken deliberately by kids back in the day for the glass marble inside!
My grandmother could remember breaking "Codd"* bottles as a child for the marble I recall, when showing her my latest 'find' back in the 70's when I went looking for these things.
*
Hiram Codd being the inventor.
on that page: '
His earlier bottles are prized by antique bottle collectors worldwide' 
here's an Alnwick Brewery Codd bottle with a slightly different design to the 'pinches' in the neck for trapping the marble:
