Polyphon 6½ inch (16.4cm) Disc Musical Box with 4 Bells plays A Country Wedding 

This is the cheaper model with 4 Bells, it plays standard discs and the bells are just duplicating the bass / lowest notes.
The Musical Box Society Website is www.mbgsb.org.uk
For Further Information please contact info@musical-box.org
If you would like to hear More Mechanical Musical Instruments,
please look for Mechanical Music Radio
www.mechanicalmusicradio.co.uk/