Tannhauser 11¾ inch (29.8cm) Disc Musical Box plays two tunes from one disc 1211 March & Serenade 

The two tunes are Unsere Garde March and Mandolin Serenade.
This make plays two tunes from one disc, there is a knob on the front of the case denotes whether tune A or B is played.
The Musical Box Society Website is www.mbsgb.org.uk
For Further Information please contact youtube@musical-box.org
If you would like to hear More Mechanical Musical Instruments,
please look for Mechanical Music Radio
www.mechanicalmusicradio.co.uk/